A bit mean, perhaps, when forgetful chief leaves (5)

I believe the answer is:

catty

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'a bit mean' is the definition.
'catty' can be an answer for 'mean' (I've seen this in another clue). I am unsure of the 'a bit' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for catty that I've seen before include "Backbiting" , "Bitchy as a feline" , "It's like a queen" , "Spiteful in feline way" , "Mean and spiteful" .)

I've seen this clue in The Irish Times.

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