Crossword Genius

Prince Charlie with that old-fashioned calm (7)

Ross

I believe the answer is:

halcyon

'calm' is the definition.
(I've seen this in another clue)

'prince charlie with that old-fashioned' is the wordplay.
'prince' becomes 'hal' (Shakespearean nickname of Henry V when a prince).
'charlie' becomes 'C' (phonetic alphabet: alpha, bravo, charlie etc.).
'with' says to put letters next to each other.
'that old-fashioned' becomes 'yon' ('yon' is an archaic word for 'that').
'hal'+'c'+'yon'='HALCYON'

(Other definitions for halcyon that I've seen before include "Bird" , "Of a period, happy and peaceful - say youth" , "Balmy" , "Tropical kingfisher" , "Such days are calm and happy" .)

I've seen this clue in The Times.
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