Petition (4)
'petition' is the definition.
(petition can mean to plea or beg)
This is the entire clue.
(Other definitions for plea that I've seen before include "Excuse; petition" , "Excuse, entreaty" , "Dispute" , "Appeal - with bargaining?" , "Guilty perhaps" .)
(Other definitions for urge that I've seen before include "'Spur on, encourage (4)'" , "Strong impulse, desire" , "Strong desire; impel" , "Strong, restless desire" , "Encourage (to do something)" .)
'petition' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for pray that I've seen before include "Devoutly hope" , "Address God" , "make supplications" , "Call upon in supplication" , "Wish earnestly (for a particular outcome)" .)
'petition' is the definition.
(both can mean to appeal or ask for something)
This is the entire clue.
(Other definitions for sue that I've seen before include "Begin legal proceedings against" , "Bring a legal action" , "Take case against in court" , "Charge" , "Susan (dim.)" .)
'petition' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ask that I've seen before include "Issue invitations" , "Put a question" , "Enquire" , "Make enquiry" , "Pose" .)
'petition' is the definition.
(I know that petition can be written as prayer)
This is the entire clue.
(Other definitions for prayer that I've seen before include "Paternoster, for example" , "Earnest hope" , "words of church service?" , "Address to god" , "Request to deity" .)
'petition' is the definition.
(appeal is a kind of petition)
This is the entire clue.
(Other definitions for appeal that I've seen before include "Bring verdict for review by higher court" , "prayer" , "Plea" , "Take case to higher court to challenge verdict" , "Pray, invoke" .)
'petition' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for invoke that I've seen before include "Call on (a deity)" , "Call upon in prayer, perhaps for protection" , "Call on a god or spirit" , "Call on a god to do something" , "Summon into action or bring into existence" .)
'petition' is the definition.
(both can mean to request or implore)
This is all the clue.
(Other definitions for solicit that I've seen before include "Seek to obtain, ask earnestly" , "Accost - request" , "Drum up business" , "Beg - hustle" , "Request, canvas" .)