Crossword Genius

Friend of Opal's (3)

Ross

I believe the answer is:

pal

'friend' is the definition.
(pal can mean a friend)

'of opal's' is the wordplay.
'of' indicates the answer is hidden within the clue.
'PAL' is hidden within 'opals'.

(Other definitions for pal that I've seen before include "Mate, informal friend" , "Buddy, chum" , "China" , "Mate, buddy" , "Friend (colloq.)" .)

I've seen this clue in the Evening Standard.
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