Crossword Genius

Nick may be official in parliament (4)

Ross

I believe the answer is:

whip

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'official in parliament' is the definition.
(whips enforce party discipline in parliament)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for whip that I've seen before include "Address insultingly" , "The one who enforces discipline in a political party" , "Flog - pinch" , "Legislator appointed by a party to enforce discipline" , "MP enforcing discipline" .)

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