Crossword Genius

One hint left within another? (4)

Ross

I think it could be either:

clue

line
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'one hint' is the definition.
(synonyms)

'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).
'clu'+'e'='CLUE'

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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