College dance, one round end of April (7)

I believe the answer is:

balliol

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'college' is the definition.
(Balliol College, Oxford)

'dance one round end of april' is the wordplay.
'dance' becomes 'ball' (ball is a kind of dance).
'one round' says the letters should be written in reverse.
'end of april' becomes 'loi' (I can't justify this - if you can you should believe this answer much more).
'loi' written backwards gives 'iol'.
'ball'+'iol'='BALLIOL'

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(Other definitions for balliol that I've seen before include "Wycliffe and Jowett were both Masters of this Oxford college" , "C13 Oxford college" .)

I've seen this clue in The Telegraph.

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