Control may rest in the wrong position (7)

I believe the answer is:

mastery

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'control' is the definition.
(mastery can mean control or command of something)

'may rest in the wrong position' is the wordplay.
'may rest' can be anagrammed to 'MASTERY'.
Though, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for mastery that I've seen before include "rule" , "Total control" , "Control - supreme skill" , "Comprehensive knowledge (of a subject)" , "superior knowledge" .)

I've seen this clue in The Globe and Mail.

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