Distinguish from patella (4)

I believe the answer is:

tell

'distinguish' is the definition.
('tell' can be a synonym of 'distinguish')

'from patella' is the wordplay.
'from' indicates a hidden word.
'TELL' can be found hidden inside 'patella'.

(Other definitions for tell that I've seen before include "toxophilite" , "Instruct" , "One who refused to accept tyranny" , "his hitting the apple?" , "work in a bank" .)

I've seen this clue in The Mirror.

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