Crossword Genius

Spooner's watchman arrived for deck activity? (4,4)

Ross

I believe the answer is:

card game

I'm a little stuck... Click here to teach me more about this clue!

'activity?' is the definition.
(I know that card game is a type of game)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for card game that I've seen before include "nap perhaps" , "old maid?" , "'Rummy or bridge, say (4,4)'" , "Patience for one" , "Poker or bridge" .)

I've seen this clue in the Sydney Morning Herald.
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