A means of access for jeweller’s stone (5)

I believe the answer is:

agate

'jeweller's stone' is the definition.

'a means of access' is the wordplay.
'means of access' becomes 'gate'.
'a'+'gate'='AGATE'

'for' is the link.

(Other definitions for agate that I've seen before include "Semi-precious quartz" , "Hard stone with concentric bands of colour" , "Type of quartz" , "marble" , "rock with bands" .)

I've seen this clue in The Times.

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