Crossword Genius

To breathe a little is quite usual! (5)

Ross

I believe the answer is:

habit

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

'quite usual' is the definition.
I can't judge whether this defines the answer.

'to breathe a little' is the wordplay.
'to breathe' becomes 'ha' (I can't explain this - if you can you should give a lot more credence to this answer).
'a little' becomes 'bit' (both can mean a small amount of something).
'ha'+'bit'='HABIT'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for habit that I've seen before include "can cause addiction" , "Custom or established practice" , "nun gets into" , "Monk's gown or custom" , "Ingrained behaviour" .)

I've seen this clue in the Evening Standard.
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