Crossword Genius

Unusual word of action (9,4)

Ross

I believe the answer is:

irregular verb

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

'action' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'unusual word' is the wordplay.
'unusual' becomes 'irregular' (synonyms).
'word' becomes 'verb' (verb is a kind of word).
'irregular'+'verb'='IRREGULAR VERB'

'of' is the link.

Can you help me to learn more?

(Another definition for irregular verb that I've seen is " Go for one".)

I've seen this clue in The Irish Independent.
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