Good scope for one working in stable (5)
I believe the answer is:
groom
'one working in stable' is the definition.
'good scope' is the wordplay.
'good' becomes 'g' (abbreviation).
'scope' becomes 'room' (both can mean space).
'g'+'room'='GROOM'
'for' acts as a link.
(Other definitions for groom that I've seen before include "New husband" , "man of the match" , "Train, make ready" , "Bride's choice" , "Prepare; one getting wed" .)