A blow from Angus Thompson (4)
I believe the answer is:
gust
'a blow' is the definition.
(as in a gust of wind)
'from angus thompson' is the wordplay.
'from' indicates a hidden word.
'GUST' is hidden in the letters of 'angus thompson'.
(Other definitions for gust that I've seen before include "Puff (of wind)" , "Blast of air" , "Sudden blast of wind" , "Sudden blow of wind" , "Burst of strong wind" .)