Georgia master has piece for opening manoeuvre (6)
I believe the answer is:
gambit
'opening manoeuvre' is the definition.
(I've seen this before)
'georgia master has piece' is the wordplay.
'georgia' becomes 'GA' (abbreviation for the US state).
'master' becomes 'm'.
'has' is a charade indicator (letters next to each other).
'piece' becomes 'bit' (bit is a kind of piece).
'ga'+'m'+'bit'='GAMBIT'
'for' acts as a link.
(Other definitions for gambit that I've seen before include "Initial move in chess" , "tricky move" , "first move" , "Opening chess move" , "play involving sacrifice" .)