Work units heard of in Holland (6)

I believe the answer is:

joules

'work units' is the definition.
(joule is a kind of work unit)

'heard of in holland' is the wordplay.
'heard of in' shows a homophone (sound like).
'holland' becomes 'jools' (Jools Holland).
'jools' is a homophone of 'JOULES'.

I've seen this clue in The Guardian.

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