Changes suitable to feature in publicity (6)
I believe the answer is:
adapts
'changes' is the definition.
(adapting is a kind of changing)
'suitable to feature in publicity' is the wordplay.
'suitable' becomes 'apt' (I've seen this in another clue).
'to feature in' is an insertion indicator.
'publicity' becomes 'ads' (advert).
'apt' inserted within 'ads' is 'ADAPTS'.
(Other definitions for adapts that I've seen before include "Fits" , "Change to fit new circumstances" , "Alters to suit new conditions" , "Alters to suit another purpose" , "Alters to fit" .)