Fuss caused by flirt (5,2)
I believe the answer is:
carry on
I believe this is a double definition.
'fuss' is the first definition.
(I've seen this before)
'flirt' is the second definition.
(I've seen this before)
'caused by' is the link.
(Other definitions for carry on that I've seen before include "Display of fussing" , "Continue like British comedy films?" , "Keep going!" , "Questionable behaviour" , "Don't stop" .)