Wild at having turned it into disused currency (7)

I believe the answer is:

frantic

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'wild' is the definition.
(I know that frantic is a more specific form of the attribute wild)

'having turned it into disused currency' is the wordplay.
'having turned' is a reversal indicator.
'into' is an insertion indicator.
'disused currency' becomes 'franc' (old French currency. I am not sure about the 'disused' bit.).
'it' reversed gives 'ti'.
'ti' placed into 'franc' is 'FRANTIC'.

'at' is the link.

Can you help me to learn more?

(Other definitions for frantic that I've seen before include "having kittens" , "very worried" , "Mad" , "Distraught with fear" , "Wild - frenzied" .)

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

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