Angry, being pest-infested (5)

I believe the answer is:

ratty

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'angry' is the definition.
(thesaurus)

'pest-infested' is the wordplay.
'pest' becomes 'rat' (rat can mean a nasty person).
'infested' becomes 'ty' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'rat'+'ty'='RATTY'

'being' acts as a link.

Can you help me to learn more?

(Other definitions for ratty that I've seen before include "Moley's friend" , "In a bad temper" , "water vole, literally" , "Irritable - Mole's friend!" , "One messing about in a boat" .)

I've seen this clue in the Sydney Morning Herald.

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