Let's dance in pants in private (11)
I believe the answer is:
'private' is the definition.
(I've seen this before)
'let's dance in pants' is the wordplay.
'pants' indicates an anagram (UK informal term for 'nonsense' or 'rubbish').
'letsdancein' is an anagram of 'CLANDESTINE'.
'in' is the link.
(Other definitions for clandestine that I've seen before include "through the backdoor" , "Private" , "Done secretly" , "Concealed" , "Undercover" .)