Belt in earthy shade uniform should accommodate (3,6)
I believe the answer is:
sam browne
'belt' is the definition.
(Sam Browne belt is an example)
'earthy shade uniform should accommodate' is the wordplay.
'earthy shade' becomes 'brown' (brown is an earthy colour).
'uniform' becomes 'same' (uniform can mean same or identical).
'should accommodate' is an insertion indicator (inserted letters are accommodated).
'brown' put into 'same' is 'SAM BROWNE'.
'in' acts as a link.
(Other definitions for sam browne that I've seen before include "military wear" , "Military officer's belt with shoulder strap" , "Military leather belt" .)