Light brown garments on at first for dance (5)
I believe the answer is:
tango
'for dance' is the definition.
(Tango is a dance)
'light brown garments on at first' is the wordplay.
'light brown' becomes 'tan' (tan is a light brown colour).
'at first' suggests taking the first letters.
The initial letters of 'garments on' is 'go'.
'tan'+'go'='TANGO'
(Other definitions for tango that I've seen before include "Latin American dance takes two to do it" , "Modern ballroom dance" , "tee" , "Letter T in radio comms" , "one followed by uniform" .)