Even number that's odd for the GI (5)
I believe the answer is:
eight
'even number' is the definition.
'eight' can be an answer for 'number' (I've seen this before). I am not sure about the 'even' bit.
'odd for the gi' is the wordplay.
'the gi' anagrams to 'EIGHT'.
However, I am unsure how the anagram is indicated.
'that's' is the 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." .)