Wandering to see nitrate in production (9)
I believe the answer is:
itinerant
'wandering' is the definition.
(I've seen this before)
'nitrate in production' is the wordplay.
'production' indicates an anagram.
'nitrate'+'in'='nitratein'
'nitratein' is an anagram of 'ITINERANT'.
'to see' is the link.
(Other definitions for itinerant that I've seen before include "Tramp" , "Rambling" , "(Person) on the move" , "Old labourer/traveller who travelled from place to place" , "Nomadic" .)