Emphasise snub about trophy (9)
I believe the answer is:
spotlight
'emphasise' is the definition.
(spotlighting is a kind of emphasizing)
'snub about trophy' is the wordplay.
'snub' becomes 'slight' (I've seen this before).
'about' means one lot of letters goes inside another.
'trophy' becomes 'pot' (I've seen this before).
'slight' placed around 'pot' is 'SPOTLIGHT'.
(Other definitions for spotlight that I've seen before include "Illuminate" , "Where attention is focused" , "Draw attention to" , "Prominent position" , "Stage actor may be in it" .)