Brown to depart for a dance (5)
I believe the answer is:
tango
'a dance' is the definition.
(tango is a kind of dance)
'brown to depart' is the wordplay.
'brown' becomes 'tan' (tan is a kind of brown).
'to depart' becomes 'go' ('go' can be a synonym of 'depart').
'tan'+'go'='TANGO'
'for' is the link.
(Other definitions for tango that I've seen before include "Dance; letter T" , "Dance; T (radio comms.)" , "Latin-American dance - code for T" , "Rhythmic movement" , "Last - in Paris (film)" .)