Incidental remark producing new ideas (5)
I believe the answer is:
aside
'incidental remark' is the definition.
(I've seen this before)
'new ideas' is the wordplay.
'new' indicates anagramming the letters.
'ideas' anagrammed gives 'ASIDE'.
'producing' is the link.
(Other definitions for aside that I've seen before include "Away from main action" , "Stage whisper" , "remark, incidentally" , "Aides (anag.)" , "(Pushed) out of the way" .)