A game bird for example all of a flutter (6)
I believe the answer is:
bridge
'a game' is the definition.
(card game)
'bird for example all of a flutter' is the wordplay.
I cannot quite see how this works, but
an anagram of 'bird' is 'brid' which is present in the answer.
The remaining letters 'ge' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for bridge that I've seen before include "pontoon, perhaps" , "A walkover" , "Four-handed card game" , "Hard ridge on the nose" , "Span of popular card game" .)