Musician parking in middle of Brighton attraction (5)
I believe the answer is:
piper
'musician' is the definition.
(someone playing the bagpipes)
'parking in middle of brighton attraction' is the wordplay.
'parking' becomes 'p' (abbreviation on road signs).
'in middle of' means one lot of letters goes inside another.
'brighton attraction' becomes 'pier' (Brighton Pier).
'p' put inside 'pier' is 'PIPER'.
(Other definitions for piper that I've seen before include "'Liam O'Flynn or Seamus Ennis, say (5)'" , "who puffs out his cheeks?" , "One plays" , "Artist known for his stained glass in Coventry Cathedral, d. 1992" , "Highland musician" .)