Loud, and not just in pleasure ground (7)
I believe the answer is:
funfair
'pleasure ground' is the definition.
('funfair' can be a synonym of 'pleasure ground')
'loud and not just in' is the wordplay.
'loud' becomes 'f' (A musical term).
'and' says to put letters next to each other (I've seen this in other clues).
'not' becomes 'un' (I've seen this in other clues).
'just' becomes 'fair' ('fair' is associated in meaning with 'just'**).
'in' means one lot of letters goes inside another.
'f' after 'un' is 'unf'.
'unf' placed inside 'fair' is 'FUNFAIR'.
(Other definitions for funfair that I've seen before include "entertainment for the family?" , "Amusements here" , "place of amusement" , "Swings and roundabouts" , "Amusement park" .)