Be prominent and covered in fat? (5,3)
I believe the answer is:
stand out
'be prominent' is the definition.
(I've seen this before)
'and covered in fat?' is the wordplay.
'covered in' indicates putting letters inside.
'fat?' becomes 'stout' (similar in meaning).
'and' placed within 'stout' is 'STAND OUT'.
(Other definitions for stand out that I've seen before include "Refuse to agree - project" , "Be proud" , "Catch the eye" , "Be conspicuous, or persist in demands" , "Don't agree to - project" .)