April wind swirling round a city in Pakistan (10)
I believe the answer is:
rawalpindi
'city in pakistan' is the definition.
(I've seen this before)
'april wind swirling round a' is the wordplay.
'swirling' indicates anagramming the letters.
'round' indicates putting letters inside.
'april'+'wind'='aprilwind'
'aprilwind' anagrammed gives 'rwalpindi'.
'rwalpindi' placed around 'a' is 'RAWALPINDI'.
(Other definitions for rawalpindi that I've seen before include "Pakistani city" , "Ancient city" , "City in NE Pakistan" .)