After reflecting, say a card game is rubbish (7)
I believe the answer is:
garbage
'rubbish' is the definition.
(both can mean refuse or trash)
'after reflecting say a card game' is the wordplay.
'after reflecting' is a reversal indicator.
'say' becomes 'eg' (both can mean for example).
'card game' becomes 'brag' (brag is an old card game).
'eg'+'a'+'brag'='egabrag'
'egabrag' in reverse letter order is 'GARBAGE'.
'is' acts as a link.
(Other definitions for garbage that I've seen before include "Refuse - worthless talk" , "'Refuse, rubbish (7)'" , "Litter" , "Refuse - tripe" , "Waste, refuse" .)