There's not much for John in Sherwood (6)
I believe the answer is:
little
'there's' is the definition.
Both the answer and definition are adverbs. Maybe there's an association between them I don't understand?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for little that I've seen before include "Piddling" , "part of Stuart in film?" , "Self-important authoritarian" , "Small in quantity or degree" , "Diminutive" .)