Work for some cause (3)

I believe the answer is:

use

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

'work' is the definition.
(I know that use is a type of work)

'some cause' is the wordplay.
'USE' is hidden within the letters.
But, I am not sure how the hidden word is indicated.

'for' is the link.

Can you help me to learn more?

(Other definitions for use that I've seen before include "Apply, employ" , "Exploit unfairly" , "Employ, put into service" , "Manipulate" , "Employment; utilise" .)

I've seen this clue in the Evening Standard.

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