Crazy about tango feat (5)
I believe the answer is:
stunt
'feat' is the definition.
(stunt is a kind of feat)
'crazy about tango' is the wordplay.
'crazy' becomes 'nuts' (I've seen this before).
'about' shows that the letters should be reversed in order.
'tango' becomes 't' (phonetic alphabet: alpha, bravo, charlie etc.).
'nuts' backwards is 'stun'.
'stun'+'t'='STUNT'
(Other definitions for stunt that I've seen before include "Exhibitionistic performance" , "Check the growth of (something)" , "Spectacular exploit" , "Publicity seeking escapade" , "Dwarf" .)