Month of gold rush (6)
I believe the answer is:
august
'month' is the definition.
(August is an example)
'gold rush' is the wordplay.
'gold' becomes 'au' ('Au' can be a synonym of 'gold').
'rush' becomes 'gust' (I have seen 'Rush of wind ' mean 'gust' so perhaps 'rush' could also mean 'gust').
'au'+'gust'='AUGUST'
'of' is the link.
(Other definitions for august that I've seen before include "could get sunburned this time of year!" , "Month named after a Roman emperor" , "Inspiring respect; month" , "part of the summer" , "Inspiring respect and admiration" .)