Henry Marsh welcomes parking beside US city - little money is needed (9)
I believe the answer is:
'beside us city little money is needed' is the definition.
I can't judge whether this definition defines the answer.
'henry marsh welcomes parking' is the wordplay.
'henry' becomes 'hal'.
'marsh' becomes 'fenny' (I am not sure about this - if you are sure you should believe this answer much more).
'welcomes' is an insertion indicator (in sense of 'invites in').
'parking' becomes 'p'.
'fenny' enclosing 'p' is 'fpenny'.
Can you help me to learn more?
(Other definitions for halfpenny that I've seen before include "Old coin, 24 to a shilling" , "Four hundred and eighty such in one pound, once" , "Former coin" .)