Cancel eccentric way to win prize (7,4)

I believe the answer is:

scratch card

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

'way to win prize' is the definition.
I can't judge whether this definition defines the answer.

'cancel eccentric' is the wordplay.
'cancel' becomes 'scratch' (I've seen this before).
'eccentric' becomes 'card' (I've seen this before).
'scratch'+'card'='SCRATCH CARD'

Can you help me to learn more?

(Other definitions for scratch card that I've seen before include "may offer instant reward" , "Gambler's investment rubbed with a coin" , "one offering prize after scoring?" , "Expert at golf club perhaps" , "Instant lottery ticket" .)

I've seen this clue in The Mirror.

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