Stocking half on, only twisted (5)
I believe the answer is:
nylon
'stocking' is the definition.
(nylon stocking is a kind of stocking)
'half on only twisted' is the wordplay.
'half' indicates taking half.
'twisted' is an anagram indicator.
'on' with half the letters taken is 'n'.
'only' anagrammed gives 'ylon'.
'n'+'ylon'='NYLON'
(Other definitions for nylon that I've seen before include "Artificial fabric" , "Man-made material" , "Man-made fabric" , "Strong, resilient, synthetic fibre" , "Fibrous material" .)