Tribesman put sash round (3)
I believe the answer is:
ibo
'tribesman' is the definition.
(the Ibo or Igbo are a Nigerian people)
'sash round' is the wordplay.
'sash' becomes 'obi' (type of Japanese sash or belt).
'round' is a reversal indicator.
'obi' reversed gives 'IBO'.
'put' acts as a link.
(Other definitions for ibo that I've seen before include "Language used by some Africans" , "Native of SE Nigeria" , "W African language" , "One of chief cultural languages of Nigeria" , "SE Nigerian language" .)