Good scope for manoeuvre (6)
I believe the answer is:
gambit
'manoeuvre' is the definition.
(gambit is a kind of manoeuvre)
'good scope' is the wordplay.
'good' becomes 'g' (abbreviation).
'scope' becomes 'ambit' ('ambit' can be a synonym of 'scope'**).
'g'+'ambit'='GAMBIT'
'for' is the link.
(Other definitions for gambit that I've seen before include "play involving sacrifice" , "Stratagem in chess" , "Opening chess move" , "Sacrificial strategy in chess" , "Opening manoeuvre" .)