Clique grow up out West (5)
I believe the answer is:
group
'clique' is the definition.
(I've seen this before)
'grow up out west' is the wordplay.
'out' suggests deleting specific letters.
'west' becomes 'w' ('W' can be a synonym of 'west').
'grow'+'up'='growup'
'growup' with 'w' taken away is 'GROUP'.
(Other definitions for group that I've seen before include "Number or people or things classed together" , "Set; band" , "Band, assembly" , "Clique" , "Set, faction" .)