Crossword Genius

Work too hard in connection with duty (7)

Ross

I believe the answer is:

overtax

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'work too hard' is the definition.
(to overtax someone is to work them too hard)

'connection with duty' is the wordplay.
'connection with' becomes 'over' (I can't explain this - if you can you should believe this answer much more).
'duty' becomes 'tax' (I've seen this before).
'over'+'tax'='OVERTAX'

'in' is the link.

Can you help me to learn more?

(Other definitions for overtax that I've seen before include "Put too great a strain on, as Revenue Commissioners do" , "Press too hard" , "Require too much" , "Put too much pressure on, like Revenue Commissioners" , "Make excessive demands on (a person's abilities)" .)

I've seen this clue in The Telegraph and The Times.
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