Extremely keen on money for workers in yard (8)

I believe the answer is:

knackers

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

'workers in yard' is the definition.
'knackers' can be an answer for 'workers' (knacker is a kind of worker). I'm not certain of the 'in yard' bit.

'extremely keen on money' is the wordplay.
'extremely' suggests removing the centre (only the extremes of the word are used).
'on money' becomes 'ackers' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'keen' with its middle removed is 'kn'.
'kn'+'ackers'='KNACKERS'

'for' acts as a link.

Can you help me to learn more?

(Another definition for knackers that I've seen is " Horse slaughterers".)

I've seen this clue in The Guardian.

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