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One million quid put under lock and key (7)


I believe the answer is:


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'lock and key' is the definition.
I can't tell whether this defines the answer.

'one million quid put under' is the wordplay.
'one million' becomes 'im' (resembles 1m, 1 million).
'quid' becomes 'pound' (synonyms).
'put under' means one lot of letters go next to another.

Can you help me to learn more?

(Other definitions for impound that I've seen before include "Shut up" , "Take property into legal custody" , "Sequester" , "Seize and take into legal custody" , "Take legal possession of" .)

I've seen this clue in The Times.
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