Crossword Genius

Unusually deep friend suggests it's been determined in advance (10)

Ross

I believe the answer is:

predefined

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'it's been determined in advance' is the definition.
I can't judge whether this definition defines the answer.

'unusually deep friend' is the wordplay.
'unusually' indicates anagramming the letters.
'deep'+'friend'='deepfriend'
'deepfriend' anagrammed gives 'PREDEFINED'.

'suggests' is the link.

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I've seen this clue in The Irish Times.
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