He's treacherous, a bit of an ingrate (3)

I believe the answer is:

rat

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'he's treacherous a bit' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'of an ingrate' is the wordplay.
'of' indicates a hidden word.
'RAT' can be found hidden inside 'ingrate'.

Can you help me to learn more?

(Other definitions for rat that I've seen before include "Destructive rodent" , "Treacherous rodent" , "Strike-breaker" , "one who deserts the sinking ship?" , "Contemptible person" .)

I've seen this clue in the Evening Standard.

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