Crossword Genius

A calm hiker is reoriented perfectly (4,1,5)

Ross

I believe the answer is:

like a charm

I'm a little stuck... Click here to teach me more about this clue!

'perfectly' is the definition.
(I've seen this before)

'a calm hiker is reoriented' is the wordplay.
'a calm hiker' can be anagrammed to 'LIKE A CHARM'.
But, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for like a charm that I've seen before include "in swimming style" , "successfully" , "Perfectly, as if by magic (colloq.)" .)

I've seen this clue in The Guardian.
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