Dorothy rejected love, creating hoo-ha (2-2)
I believe the answer is:
to-do
'hoo-ha' is the definition.
'dorothy rejected love' is the wordplay.
'dorothy' becomes 'dot' (nickname for someone called Dorothy).
'rejected' shows that the letters should be reversed in order.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'dot' back-to-front is 'tod'.
'tod'+'o'='TO-DO'
'creating' is the link.
(Other definitions for to-do that I've seen before include "Bustle" , "Fuss or commotion" , "Quarrel" , "Spot of bother" , "Kerfuffle" .)