Crossword Genius

Jokes that are anything but clean? (5,6)

Ross

I believe the answer is:

black humour

I'm a little stuck... Click here to teach me more about this clue!

'are anything but clean?' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'jokes' is the wordplay.
I cannot quite see how this works, but
'jokes' could be 'humour' (I've seen this before) and 'humour' is present in the answer.
The remaining letters 'black' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

'that' acts as a link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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