Crossword Genius

Tendency for a doctor to be unusually fit (5)

Ross

I believe the answer is:

drift

'tendency' is the definition.
(I know that drift is a type of tendency)

'doctor to be unusually fit' is the wordplay.
'doctor' becomes 'dr' (abbreviation).
'to be unusually' indicates an anagram.
'fit' anagrammed gives 'ift'.
'dr'+'ift'='DRIFT'

'for a' is the link.

(Other definitions for drift that I've seen before include "General idea (of snow?)" , "Float along as on waves" , "Move with the current" , "Float with current" , "move around without end" .)

I've seen this clue in the Evening Standard.
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