We take taxmen to party? Eccentric! (6)
I believe the answer is:
weirdo
'eccentric' is the definition.
(thesaurus)
'we take taxmen to party?' is the wordplay.
'take' says to put letters next to each other.
'taxmen' becomes 'ir' (I've seen this in other clues).
'to party?' becomes 'do' (do is a kind of party).
'we'+'ir'+'do'='WEIRDO'
(Other definitions for weirdo that I've seen before include "Way-out person" , "Fruitcake" , "An eccentric (sl.)" , "Eccentric type" , "Slang for odd or eccentric person" .)