Label flat boot as wrong for game (5,8)

I believe the answer is:

table football

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'game' is the definition.
(I have seen 'Indoor game ' mean 'table football' so perhaps 'game' could also mean 'table football')

'label flat boot as wrong' is the wordplay.
'label flat boot' anagrams to 'TABLE FOOTBALL'.
But, I am unsure how this is indicated.

'for' is the link.

Can you help me to learn more?

(Other definitions for table football that I've seen before include "Game played with model players attached to metal rods aiming to score goals" , "Indoor game" , "Game with revolving soccer players!" .)

I've seen this clue in The Daily Express.

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