Offer put in exchanged for refund: it's an enticement (9,5)
I believe the answer is:
forbidden fruit
'an enticement' is the definition.
(thesaurus)
'offer put in exchanged for refund it's' is the wordplay.
'offer' becomes 'bid' ('bid' can be a synonym of 'offer').
'put in' indicates putting letters inside.
'exchanged' indicates anagramming the letters.
'for'+'refund'+'it'='forrefundit'
'forrefundit' with letters rearranged gives 'fordenfruit'.
'bid' inserted inside 'fordenfruit' is 'FORBIDDEN FRUIT'.
(Other definitions for forbidden fruit that I've seen before include "Something naughty not allowed" , "Apple" , "Restricted as to diet?" , "Illicit pleasure" .)