Exploits at work finally impress weaklings (8)

I believe the answer is:

milksops

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

'weaklings' is the definition.
(I know this)

'exploits at work finally impress' is the wordplay.
I cannot quite see how this works, but
'exploits' could be 'milks' (milking is a kind of exploiting) and 'milks' is located in the answer.
'work' could be 'op' (abbreviation for opus) and 'op' is located in the answer.
A single letter 's' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Guardian.

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