A rustic source of fodder (7)
I believe the answer is:
hayseed
'a rustic' is the definition.
(I know that hayseed is a type of rustic)
'source of fodder' is the wordplay.
I cannot really understand how this works, but
'source' could be 'seed' (synonyms) and 'seed' is present in the answer.
'fodder' could be 'hay' (hay is a kind of fodder) and 'hay' is located in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for hayseed that I've seen before include "Countryman" , "Yokel" , "Had eyes (anag.)" , "Simple country person" , "Rustic" .)