Music and endless fun in the London area (6)
I believe the answer is:
poplar
'london area' is the definition.
(I've seen this before)
'music and endless fun' is the wordplay.
'music' becomes 'pop' (pop music is a kind of music**).
'and' means one lot of letters go next to another.
'endless' means to remove the last letter.
'fun' becomes 'lark' (I've seen this before).
'lark' with its final letter removed is 'lar'.
'pop'+'lar'='POPLAR'
'in the' acts as a link.
(Other definitions for poplar that I've seen before include "Tree - London district" , "part of London" , "part of our capital" , "Timber tree" , "Softwood tree with catkins" .)