Worker originally in the outskirts of Derby when it's blustery (5)
I believe the answer is:
windy
'it's blustery' is the definition.
(thesaurus)
'worker originally in the outskirts of derby' is the wordplay.
'originally' says to take the initial letters.
'the outskirts of' suggests removing the centre (letters on the edges or outskirts are used).
'derby' with its centre taken out is 'dy'.
The first letter of 'worker' is 'w'.
'w'+'in'+'dy'='WINDY'
'when' is the link.
(Other definitions for windy that I've seen before include "Chicago, the _____ City" , "The sort of weather" , "Blowy" , "Conceited - nervous - registering on the Beaufort scale" , "far from calm" .)