Plain or extremely loud check trousers (5)
I believe the answer is:
veldt
'plain' is the definition.
(I've seen this before)
'extremely loud check trousers' is the wordplay.
'extremely' suggests removing the centre (only the extremes of the word are used).
'check' becomes 'vet' (I've seen this in other clues).
'trousers' is an insertion indicator (to trouser can mean to steal or take).
'loud' with its centre removed is 'ld'.
'ld' inserted inside 'vet' is 'VELDT'.
'or' is the link.
(Other definitions for veldt that I've seen before include "South African grassland" , "South African plain" , "Open grassland in South Africa" , "Southern African prairie" , "Southern African grassland" .)