Fellow with pimple going round the States - one who's hard to please (7)
I believe the answer is:
fusspot
'one who's hard to please' is the definition.
I can't judge whether this definition defines the answer.
'fellow with pimple going round the states' is the wordplay.
'fellow' becomes 'F' (abbreviation - of a society etc.).
'with' is a charade indicator (letters next to each other).
'pimple' becomes 'spot' (I've seen this before).
'going round' is an insertion indicator (some letters go around others).
'the states' becomes 'US' (abbreviation for the United States).
'f'+'spot'='fspot'
'fspot' going around 'us' is 'FUSSPOT'.
Can you help me to learn more?
(Other definitions for fusspot that I've seen before include "One who worries too much" , "One who gets worked up" , "Pernickety person" , "Over-fastidious person" , "Finicky person" .)