Shop with constant promises to provide choice (9)
I believe the answer is:
delicious
'choice' is the definition.
(thesaurus)
'shop with constant promises' is the wordplay.
'shop' becomes 'deli' (delicatessen).
'with' is a charade indicator (letters next to each other).
'constant' becomes 'c' (mathematical abbreviation).
'promises' becomes 'IOUs' (promises to pay a debt).
'deli'+'c'+'ious'='DELICIOUS'
'to provide' acts as a link.
(Other definitions for delicious that I've seen before include "Pleasant tasting" , "very nice" , "Yummy" , "Scrumptious" , "Very pleasant to taste" .)