Prepare gen vigorously for consultation document (5,5)
I believe the answer is:
green paper
'consultation document' is the definition.
'prepare gen vigorously' is the wordplay.
'vigorously' indicates an anagram (the letters move vigorously around).
'prepare'+'gen'='preparegen'
'preparegen' is an anagram of 'GREEN PAPER'.
'for' is the link.
(Other definitions for green paper that I've seen before include "basis for discussion?" , "Preliminary report" .)