One providing cast-off clothing? (7)
I believe the answer is:
knitter
'one providing cast-off clothing?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
This is the entire clue.
Can you help me to learn more?
(Other definitions for knitter that I've seen before include "one on way to Jersey?" , "One uses needles and wool" , "Trinket for worker in wool" , "Purser maybe" , "construction worker" .)