Chuck up? (3)
I believe the answer is:
lob
This clue is a double definition.
'chuck' is the first definition.
(I've seen this before)
'up?' is the second definition.
(thesaurus)
(Other definitions for lob that I've seen before include "Throw in high, slow arc" , "Shot of Murray" , "Loft" , "Fling" , "Pollack" .)