An act possibly reciprocated (4)

I believe the answer is:

deed

I'm a little stuck... Click here to teach me more about this clue!

'an act possibly' is the definition.
(I know that legislation is a type of administration)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for deed that I've seen before include "Intentional action" , "Something done" , "Act - exploit - legal document" , "Document showing ownership" , "Heroic exploit" .)

I've seen this clue in the Evening Standard.

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