Crossword Genius

Old friend has a jewel (4)

Ross

I believe the answer is:

opal

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

'old friend' is the wordplay.
'old' becomes 'o' (abbreviation).
'friend' becomes 'pal' (pal can mean a friend).
'o'+'pal'='OPAL'

'has' acts as a link.

(Other definitions for opal that I've seen before include "item in Hatton Garden?" , "raw material" , "little jewel" , "Delicately coloured gem" , "Gem stone" .)

I've seen this clue in The Mirror.
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