Shows response concerning legislation (6)

I believe the answer is:

reacts

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'shows response' is the definition.
Although both the answer and definition are verbs in their -s form, I don't see how one could define the other.

'concerning legislation' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'legislation' becomes 'acts' (I've seen this in another clue).
're'+'acts'='REACTS'

Can you help me to learn more?

(Other definitions for reacts that I've seen before include "Responds to an impulse" , "Acts in response to something" , "Responds to stimulus (6)" , "Retaliates" .)

I've seen this clue in the Evening Standard.

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