Newly-wed adopts golf, a tricky game (6)
I believe the answer is:
bridge
'a tricky game' is the definition.
(card game involving 'tricks')
'newly-wed adopts golf' is the wordplay.
'newly wed' becomes 'bride' (I've seen this in other clues).
'adopts' indicates putting letters inside.
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
'bride' placed around 'g' is 'BRIDGE'.
(Other definitions for bridge that I've seen before include "Card-game" , "indoor game" , "spanner" , "Span of popular card game" , "Join" .)