Crossword Genius

A measure of substance in unusual card game (8)

Ross

I believe the answer is:

decagram

'a measure of substance' is the definition.

'unusual card game' is the wordplay.
'unusual' indicates an anagram.
'card'+'game'='cardgame'
'cardgame' anagrammed gives 'DECAGRAM'.

'in' is the link.

(Another definition for decagram that I've seen is " The weight".)

I've seen this clue in The Times.
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