Crossword Genius

A portal of stone (5)

Ross

I believe the answer is:

agate

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

'a portal' is the wordplay.
'portal' becomes 'gate' (I've seen this in another clue).
'a'+'gate'='AGATE'

'of' acts as a link.

(Other definitions for agate that I've seen before include "Quartz with bands of colour, used in jewellery" , "Type of quartz" , "Precious stone" , "Old drama critic" , "Semi-transparent stone" .)

I've seen this clue in The Mirror.
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