Dance to nag about (5)
I believe the answer is:
tango
'dance' is the definition.
(tango is a type of dance)
'to nag about' is the wordplay.
'about' indicates an anagram.
'to'+'nag'='tonag'
'tonag' anagrammed gives 'TANGO'.
(Other definitions for tango that I've seen before include "Latin American dance (requiring two?)" , "Steps" , "reputedly takes two" , "Letter T in radio comms" , "Latin-American dance - code for T" .)