Crossword Genius

Act up again (4)

Ross

I believe the answer is:

deed

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

'act' is the definition.
(I know that act can be written as deed)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for deed that I've seen before include "What's done" , "Heroic exploit" , "documentary evidence" , "Action - legal document" , "Something done" .)

I've seen this clue in the Evening Standard.
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