Reply on legislative document (5)

I believe the answer is:

react

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'reply' is the definition.
(thesaurus)

'on legislative document' is the wordplay.
'on' becomes 're' ('on' can be mean 'with reference to').
'legislative document' becomes 'act' (act is a kind of document. I am not sure about the 'legislative' bit.**).
're'+'act'='REACT'

Can you help me to learn more?

(Other definitions for react that I've seen before include "Respond to something" , "Respond emotionally" , "Trace (anag)" , "Change chemically" , "Take" .)

I've seen this clue in The Telegraph.

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