Brown, off dancing (8)
I believe the answer is:
tangoing
'dancing' is the definition.
(tangoing is a kind of dancing)
'brown off' is the wordplay.
'brown' becomes 'tan' (tan is a kind of brown).
'off' becomes 'going' (both can mean departing).
'tan'+'going'='TANGOING'
(Other definitions for tangoing that I've seen before include "Dancing" , "what obsessive sunbather dreads?" , "Taking steps" .)