Promotion featured in biography, perhaps (4)
I believe the answer is:
hype
'promotion' is the definition.
(I know that hype is a type of promotion)
'featured in biography perhaps' is the wordplay.
'featured in' says the answer is hidden in the clue.
'HYPE' can be found hidden inside 'biography perhaps'.
(Other definitions for hype that I've seen before include "Blatant or sensational promotion" , "Promotional publicity" , "Advert" , "Build up" , "Extravagant promotion of a person or product" .)