Crossword Genius

Even number that's odd for the GI (5)

Ross

I believe the answer is:

eight

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

'even number' is the definition.
'eight' can be an answer for 'number' (I've seen this in another clue). I am not certain of the 'even' bit.

'odd for the gi' is the wordplay.
'the gi' can be anagrammed to 'EIGHT'.
Though, I am not sure how this is indicated.

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for eight that I've seen before include "Half a quarter" , "One over this for drunkeness" , "Number that figures in ice-skating?" , "Cardinal number" , "No. of stones in cwt." .)

I've seen this clue in the Best For Puzzles.
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