Crossword Genius

An entrance of stone (5)

Ross

I believe the answer is:

agate

'stone' is the definition.
(agate is a type of stone)

'an entrance' is the wordplay.
'an' becomes 'a'.
'entrance' becomes 'gate' (type of entrance).
'a'+'gate'='AGATE'

'of' acts as a link.

(Other definitions for agate that I've seen before include "marble" , "Decorative stone" , "Old drama critic" , "Variety of chalcedony" , "Stone with coloured bands" .)

I've seen this clue in the Evening Standard and The Mirror.
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