Recommend about five new ideas (6)
I believe the answer is:
advise
'recommend' is the definition.
(I've seen this in another clue)
'about five new ideas' is the wordplay.
'about' indicates putting letters inside.
'five' becomes 'V' (Roman numeral).
'new' indicates an anagram.
'ideas' with letters rearranged gives 'adise'.
'v' put into 'adise' is 'ADVISE'.
(Other definitions for advise that I've seen before include "Offer suggestions about the best course of action" , "Counsel, guide" , "Offer guidance to" , "Recommend (course of action)" , "Inform (of situation)" .)