Crossword Genius

End outside review regularly taken for bank’s action to support currency (12)

Ross

I believe the answer is:

intervention

'end' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe you can see an association between them that I don't see?

I cannot understand how the remainder of the clue works.

(Other definitions for intervention that I've seen before include "Agency" , "Mediation; interference" , "Action taken to improve a medical disorder" , "Mediation, stepping-in" .)

I've seen this clue in The Times.
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