A reversible action (4)

I believe the answer is:

deed

This clue is a double definition.

'a reversible' is the first definition.

'action' is the second definition.
(deed is a kind of action)

(Other definitions for deed that I've seen before include "Intentional action" , "A conscious action" , "What's done" , "Feat" , "Document showing ownership" .)

I've seen this clue in The Telegraph and The Irish News.

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