Crossword Genius

Quietly greeting letter from Greece (3)

Ross

I believe the answer is:

phi

'letter from greece' is the definition.
(letter from the Greek alphabet)

'quietly greeting' is the wordplay.
'quietly' becomes 'p' (p for piano and quiet).
'greeting' becomes 'hi' (hi is a kind of greeting).
'p'+'hi'='PHI'

(Other definitions for phi that I've seen before include "Greek letter in previous answer" , "Twenty First Greek letter, pronounced as f" , "classic character" , "Letter from the Balkans" , "Foreign character" .)

I've seen this clue in The Times.
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