Crossword Genius

Varsity man’s word for murder? (4)

Ross

I believe the answer is:

blue

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'varsity' is the definition.
The definition and answer can be both groups as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I don't understand the remainder of the clue.

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(Other definitions for blue that I've seen before include "over-extravagant" , "Oxbridge player" , "gloomy" , "Unusual moon" , "See 7 Across" .)

I've seen this clue in the Evening Standard.
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