I'm given money to hold legally (7)

I believe the answer is:

impound

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'hold legally' is the definition.
'impound' can be an answer for 'hold' (thesaurus). I'm not sure about the 'legally' bit.

'i'm given money' is the wordplay.
'given' means one lot of letters go next to another.
'money' becomes 'pound' (I've seen this in other clues).
'im'+'pound'='IMPOUND'

'to' is the link.

Can you help me to learn more?

(Other definitions for impound that I've seen before include "Take legal possession of" , "Seize and take into legal custody" , "Seize (goods) legally" , "Seize and confine (illegal vehicle)" , "Seize and take custody of (items)" .)

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

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