Crossword Genius

One with a punishing job in politics? (4)

Ross

I believe the answer is:

whip

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'one' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'with a punishing job in politics?' is the wordplay.
I cannot really understand how this works, but
'with' could be 'w' (short for with) and 'w' is located in the answer.
'in' could be 'hip' (both can mean fashionable) and 'hip' is found in the answer.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for whip that I've seen before include "defeat" , "Legislator appointed by a party to enforce discipline" , "Address insultingly" , "He maintains discipline among members" , "Disciplinary object or official" .)

I've seen this clue in the Evening Standard.
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