Titania's man in robe dancing about (6)
I believe the answer is:
oberon
'titania's man' is the definition.
(Oberon and Titania, mythical fairy king and queen)
'robe dancing about' is the wordplay.
'dancing' indicates anagramming the letters.
'about' becomes 'on' (as in a book 'on' a certain topic).
'robe' with letters rearranged gives 'ober'.
'ober'+'on'='OBERON'
'in' acts as a link.
(Other definitions for oberon that I've seen before include "King of the fairies (AMND)" , "Play King" , "Moon" , "Borneo (anag)" , "Fairy king (AMND)" .)