Crossword Genius

Ring friend for a stone (4)

Ross

I believe the answer is:

opal

'a stone' is the definition.
(thesaurus)

'ring friend' is the wordplay.
'ring' becomes 'o'.
'friend' becomes 'pal' (pal is a kind of friend).
'o'+'pal'='OPAL'

'for' is the link.

(Other definitions for opal that I've seen before include "Iridescent gemstone" , "it may be highly valued" , "Precious stone" , "National gemstone of Australia" , "Gem stone" .)

I've seen this clue in The Mirror.
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