Recommend about five different ideas (6)
I believe the answer is:
advise
'recommend' is the definition.
(thesaurus)
'about five different ideas' is the wordplay.
'about' is an insertion indicator.
'five' becomes 'v' (roman numeral).
'different' indicates an anagram.
'ideas' is an anagram of 'adise'.
'v' going inside 'adise' is 'ADVISE'.
(Other definitions for advise that I've seen before include "Suggest, recommend" , "Give counsel" , "Counsel, suggest" , "Inform (of situation)" , "Recommend (course of action)" .)