Silly try at being irascible (5)

I believe the answer is:

ratty

'irascible' is the definition.

'silly try at' is the wordplay.
'silly' is an anagram indicator.
'try'+'at'='tryat'
'tryat' anagrammed gives 'RATTY'.

'being' acts as a link.

(Other definitions for ratty that I've seen before include "Get annoyed" , "Character created by Kenneth Grahame" , "character on the river bank" , "Short" , "with pests" .)

I've seen this clue in the Evening Standard.

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