Some knit a scarf, having spun material (5)
I believe the answer is:
satin
'material' is the definition.
(satin is a kind of material)
'some knit a scarf having spun' is the wordplay.
'having' indicates the answer is hidden within the clue.
'spun' is a reversal indicator.
'nitas' is hidden within 'some knit a scarf'.
'nitas' written backwards gives 'SATIN'.
(Other definitions for satin that I've seen before include "Rich cloth" , "Smooth and silky" , "Stain on silky cloth" , "Lustrous fabric" , "Silk fabric" .)