Candidate in sandwich shop having goal to meet the Queen (9)
I believe the answer is:
pretender
'candidate' is the definition.
(thesaurus)
'sandwich shop having goal to meet the queen' is the wordplay.
'sandwich shop' becomes 'pret' (sandwich chain Pret a Manger).
'having' says to put letters next to each other.
'goal' becomes 'end' (synonyms).
'to meet' means one lot of letters go next to another.
'the queen' becomes 'ER' (Elizabeth Regina).
'pret'+'end'+'er'='PRETENDER'
'in' is the link.
(Other definitions for pretender that I've seen before include "One who claims a title or position" , "One claiming a title" , "Claimant, like Bonnie Prince Charlie" , "fake" , "Claimant to a throne, usually without just title" .)