Crossword Genius

Just a little bit catty? (4)

Ross

I believe the answer is:

atom

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

'bit catty?' is the definition.
'atom' can be an answer for 'bit' (I have seen 'Tiny bit' mean 'atom' so perhaps 'bit' could also mean 'atom'). I am unsure of the 'catty?' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for atom that I've seen before include "Tiny particle, causes mighty explosion" , "Smallest amount" , "A mighty particle, can be explosive" , "A tiny particle of matter with a big bang" , "Bit of make-up" .)

I've seen this clue in the Evening Standard.
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