Two may dance together (6)
I believe the answer is:
cancan
'dance together' is the definition.
'cancan' can be an answer for 'dance' (I've seen this before). I'm not sure about the 'together' bit.
'two may' is the wordplay.
'two' says to double the letters.
'may' becomes 'can' (synonyms).
'can' doubled is 'CANCAN'.
Can you help me to learn more?
(Other definitions for cancan that I've seen before include "High-kicking dance of a female chorus line" , "Dance of the French music halls" , "High-kicking dance of repetitive kind" , "Paris music hall dance" , "Lively stage dance, doubly permissive" .)