What comes with number of additives, found in dodgy pie shop, that'll make veg greener? (8)
I believe the answer is:
hosepipe
'that'll make veg greener?' is the definition.
'what comes with number of additives found in dodgy pie shop' is the wordplay.
'what comes with number of additives' becomes 'e' (ref to E-numbers).
'found in' is an insertion indicator.
'dodgy' indicates an anagram.
'pie'+'shop'='pieshop'
'pieshop' with letters rearranged gives 'hospipe'.
'e' going inside 'hospipe' is 'HOSEPIPE'.
(Other definitions for hosepipe that I've seen before include "used to water" , "Use this in garden" , "Firefighting equipment" , "it will water garden" , "Flexible watering tube" .)