Engineer retakes my device to open many locks (6,3)

I believe the answer is:

master key

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'device to open many locks' is the definition.
I can't tell whether this definition defines the answer.

'engineer retakes my' is the wordplay.
'engineer' is an anagram indicator.
'retakes'+'my'='retakesmy'
'retakesmy' anagrammed gives 'MASTER-KEY'.

Can you help me to learn more?

(Other definitions for master key that I've seen before include "Locker" , "most useful of the bunch?" , "needed for Common Entrance?" , "All-round opener" , "Passe-partout" .)

I've seen this clue in The Hindu.

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