Crossword Genius

A narrow opening, stone (5)

Ross

I believe the answer is:

agate

'stone' is the definition.
(I've seen this before)

'a narrow opening' is the wordplay.
'narrow opening' becomes 'gate' (I've seen this before).
'a'+'gate'='AGATE'

(Other definitions for agate that I've seen before include "Impure form of quartz with banded chalcedony, used as a gemstone" , "Semi-precious quartz" , "Quartz gem" , "rock with bands" , "Onyx" .)

I've seen this clue in The Times.
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