Obscene Oxbridge sportsperson (4)

I believe the answer is:

blue

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This clue could be a double definition.

'obscene oxbridge' is the first definition.
The definition suggests a singular noun which matches the answer.

'sportsperson' is the second definition.
(I've seen this before)

Can you help me to learn more?

(Other definitions for blue that I've seen before include "Glum, sad" , "Sad - colour" , "Dejected" , "Oxbridge player" , "entertaining rabbi" .)

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

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