Small measure, it's as broad as it's long (6,4)

'small measure' is the definition.
'square inch' can be an answer for 'measure' (thesaurus). I am not certain of the 'small' bit.

'as broad as it's long' is the wordplay.
I cannot really see how this works, but
'as' could be 'qua' (I've seen this before) and 'qua' is found within the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is located in the answer.
This may be the basis of clue (or it may be nonsense).

'it's' acts as a link.

Can you help me to learn more?