Notice suitable fashion (5)
I believe the answer is:
adapt
'fashion' is the definition.
(I've seen this before)
'notice suitable' is the wordplay.
'notice' becomes 'ad' (both can mean an advertisement).
'suitable' becomes 'apt' (apt means appropriate or fitting).
'ad'+'apt'='ADAPT'
(Other definitions for adapt that I've seen before include "Put to particular use" , "rewrite for broadcasting" , "Tailor" , "Modify, adjust" , "Adjust (to changes)" .)