Long narrow crack (7)

I believe the answer is:

fissure

'long narrow crack' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for fissure that I've seen before include "Deep crack in rock" , "Long, narrow crack" , "Cleft" , "Split, crack" , "Split - cleavage" .)

I've seen this clue in The Times and the King Feature Syndicate.

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