Sue for employment (3)

I believe the answer is:

use

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'sue for employment' is the definition.
(I've seen this before)

'sue for employment' is the wordplay.
'sue' anagrams to 'USE'.
But, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for use that I've seen before include "Exploit unfairly" , "Profit" , "Habitually employ" , "Employ (something)" , "Exploit; custom" .)

I've seen this clue in The Irish Independent.

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