Improvise stir-fry ingredient (6)
I believe the answer is:
noodle
'improvise' is the definition.
(noodle can mean to musically improvise)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for noodle that I've seen before include "Head - simpleton - found in soup" , "Narrow strip of pasta, or foolish person" , "Flat strip of pasta" , "Ribbon strip of pasta" , "Ribbon-like strip of pasta" .)