They could produce caustic art, sir (13)

I believe the answer is:

caricaturists

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'they' is the definition.
Both the answer and definition are plural nouns.
Perhaps you can see an association between them that I can't see?

'produce caustic art sir' is the wordplay.
'produce' is an anagram indicator (I've seen 'producing' mean this).
'caustic'+'art'+'sir'='causticartsir'
'causticartsir' is an anagram of 'CARICATURISTS'.

'could' is the link.

Can you help me to learn more?

I've seen this clue in The Irish Independent.

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