Hang around near Brighton, at the railhead (5)
I believe the answer is:
hover
'hang around' is the definition.
(hover can mean to linger or hang around)
'near brighton at the railhead' is the wordplay.
'near brighton' becomes 'hove' (I've seen this before).
'at' means one lot of letters go next to another.
'the railhead' becomes 'r' (head letter of 'rail').
'hove'+'r'='HOVER'
(Other definitions for hover that I've seen before include "Remain in the air; linger" , "Float above in the air, perhaps a craft" , "Be stationary in the air" , "Hang around (in air)" , "Remain in one place in the air" .)