A gust blows around Lisbon's river (5)
I believe the answer is:
tagus
'lisbon's river' is the definition.
(I've seen this before)
'a gust blows' is the wordplay.
'blows' indicates an anagram.
'a'+'gust'='agust'
'agust' with letters rearranged gives 'TAGUS'.
'around' is the link.
(Other definitions for tagus that I've seen before include "Longest river of Iberian peninsular" , "currently moving through SW Europe?" , "Portuguese river flowing to sea near Lisbon" , "Current" , "European river" .)