Fly back with leader of orchestra for dance (5)
I believe the answer is:
tango
'for dance' is the definition.
(tango is a type of dance)
'fly back with leader of orchestra' is the wordplay.
'fly' becomes 'gnat' (type of insect).
'back' shows that the letters should be reversed in order.
'with' is a charade indicator (letters next to each other).
'leader of' indicates taking the first letters.
The first letter of 'orchestra' is 'o'.
'gnat' written backwards gives 'tang'.
'tang'+'o'='TANGO'
(Other definitions for tango that I've seen before include "musical piece" , "Activity requiring two to" , "South American dance (for two?)" , "Dance; letter T" , "Argentine dance" .)