Pa drops a long throw (5)
I believe the answer is:
pitch
'throw' is the definition.
(I know that pitch is a type of fling)
'pa drops a long' is the wordplay.
'drops' suggests deleting specific letters.
'long' becomes 'itch' (to long or itch for something is to desire it).
'pa' with 'a' removed is 'p'.
'p'+'itch'='PITCH'
(Other definitions for pitch that I've seen before include "Hurl" , "Timbre" , "Tone - football field" , "Set up a tent" , "Throw - black stuff" .)