Build pressure, with outfits given to crew (3,2,5)
I believe the answer is:
get up steam
'build pressure' is the definition.
(to get up steam is to build momentum)
'outfits given to crew' is the wordplay.
'outfits' becomes 'get-ups' ('getup' can be a synonym of 'outfit').
'given to' is a charade indicator (letters next to each other).
'crew' becomes 'team' (I've seen this before).
'getups'+'team'='GET UP STEAM'
'with' acts as a link.
(Other definitions for get up steam that I've seen before include "Gain more impetus in moving forward" , "become excited" .)