Margins too tricky for rural expert (10)
I believe the answer is:
agronomist
'rural expert' is the definition.
'agronomist' can be an answer for 'expert' (agronomist is a kind of expert). I'm unsure of the 'rural' bit.
'margins too tricky' is the wordplay.
'tricky' indicates anagramming the letters.
'margins'+'too'='marginstoo'
'marginstoo' is an anagram of 'AGRONOMIST'.
'for' is the link.
Can you help me to learn more?
(Other definitions for agronomist that I've seen before include "Crop specialist" , "Crop expert" , "occupation for expert on land" , "Farming expert" .)