Abroad, take off top (8)
I believe the answer is:
outstrip
'top' is the definition.
(I know that top can be written as outstrip)
'abroad take off' is the wordplay.
'abroad' becomes 'out' (abroad can mean away or out).
'take off' becomes 'strip' (stripping is a kind of taking off).
'out'+'strip'='OUTSTRIP'
(Other definitions for outstrip that I've seen before include "Leave behind" , "Beat" , "Go faster or do better than" , "Surpass, overtake" , "Surpass, do better than" .)