One leg lifted, beneath check material ... (5)
I believe the answer is:
chino
'material' is the definition.
(chino is a kind of material)
'one leg lifted beneath check' is the wordplay.
'one' becomes 'i' (Roman numeral).
'leg' becomes 'on' (cricket term, fielding positions).
'lifted' shows that the letters should be reversed in order (going up in down clue).
'beneath' means one lot of letters go next to another (in a down clue).
'check' becomes 'ch' (I've seen this in other clues).
'on' written backwards gives 'no'.
'i'+'no'='ino'
'ino' put after 'ch' is 'CHINO'.
(Other definitions for chino that I've seen before include "American material" , "Durable cotton fabric" , "Cotton twill fabric" , "Coarse twilled cotton fabric" , "Coarse cotton khaki-coloured fabric" .)