Wake master roughly after error (10)
I believe the answer is:
slipstream
'wake' is the definition.
(the current created behind a vehicle)
'master roughly after error' is the wordplay.
'roughly' indicates anagramming the letters.
'after' says to put letters next to each other.
'error' becomes 'slip' (slip is a kind of error).
'master' anagrammed gives 'stream'.
'stream' put after 'slip' is 'SLIPSTREAM'.
(Other definitions for slipstream that I've seen before include "Air current" , "Air behind a moving vehicle" , "Air driven back by a propeller" , "wake of moving vehicle?" , "Closely follow" .)