Crossword Genius

One hint left within another? (4)


I think it could be either:


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'one hint' is the definition.

'left within another?' is the wordplay.
'left within' becomes 'clu' (I can't explain this - if you can you should give a lot more credence to this answer).
'another?' becomes 'e' (I've seen this in other clues).

Can you help me to learn more?

(Other definitions for clue that I've seen before include "It helps solve a crime" , "It helps towards the solution" , "Crossword help" , "Hint, tip" , "Luce (anag.)" .)

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