Crossword Genius

One hint left within another? (4)

Ross

I think it could be either:

clue

line

'one hint' is the definition.
(thesaurus)

'left within another?' is the wordplay.
'left' becomes 'l' (common abbreviation).
'within' becomes 'in'.
'another?' becomes 'e' (I've seen this in other clues).
'l'+'in'+'e'='LINE'

(Other definitions for line that I've seen before include "Ancestry" , "business" , "Long narrow mark" , "Railway track; policy" , "classified information" .)

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