Timid act of throwing (3)
I believe the answer is:
shy
'timid' is the definition.
(I know that timid can be written as shy)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for shy that I've seen before include "Retiring; fling" , "'Lacking self-confidence, timid (3)'" , "Nervous or timid in company" , "Short of" , "Embarrassed in company" .)