The plea and the pleader (6)
I believe the answer is:
prayer
'the plea' is the definition.
(thesaurus)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for prayer that I've seen before include "Address to god" , "Maybe collect" , "Orison" , "Supplication ot God" , "Reverent petition to a deity" .)