Current trip brings unexpected bonus (8)
I believe the answer is:
windfall
'unexpected bonus' is the definition.
(I've seen this before)
'current trip' is the wordplay.
'current' becomes 'wind' (wind is a type of current).
'trip' becomes 'fall' (trip can mean to fall over).
'wind'+'fall'='WINDFALL'
'brings' is the link.
(Other definitions for windfall that I've seen before include "Bruised apple" , "Fruit that has fallen from the tree or sudden good fortune" , "Godsend" , "Sudden and unexpected piece of good fortune" , "Apple blown from a tree" .)