Faced with dilemma over fuss? That’s a blow (7)
I believe the answer is:
tornado
'that's a blow' is the definition.
(a tornado blows around)
'faced with dilemma over fuss?' is the wordplay.
'faced with dilemma' becomes 'torn' (torn can mean facing a decision or dilemma).
'over' is a charade indicator (letters next to each other).
'fuss?' becomes 'ado' ('ado' can be a synonym of 'fuss').
'torn'+'ado'='TORNADO'
(Other definitions for tornado that I've seen before include "Road not turned in the windstorm" , "Donator (anag.)" , "Dreadful blow" , "Windy hazard" , "Whirling storm" .)