Somehow resent accepting small bribe (9)
I believe the answer is:
sweetener
'bribe' is the definition.
(thesaurus)
'somehow resent accepting small' is the wordplay.
'somehow' indicates an anagram.
'accepting' means one lot of letters goes inside another.
'small' becomes 'wee' ('wee' can be similar in meaning to 'small'**).
'resent' is an anagram of 'stener'.
'stener' enclosing 'wee' is 'SWEETENER'.
(Other definitions for sweetener that I've seen before include "Substance like sugar" , "Saccharin, sugar or a bribe" , "pill to replace sugar" , "Saccharin, for example" , "Something tart could do with this" .)