Say 'Throw to me!' Or catch! (8)
I believe the answer is:
overhear
'catch' is the definition.
(synonyms)
'say throw to me' is the wordplay.
'say' indicates a 'sounds like' (homophone) clue.
'throw to me' becomes 'over here' (used to tell someone to throw something over here).
'overhere' is a homophone of 'OVERHEAR'.
'or' is the link.
(Other definitions for overhear that I've seen before include "Catch unintentionally" , "Listen without the speaker's knowledge, maybe by accident" , "Accidentally perceive with the ear" , "Earwig" , "Listen accidentally unknown to speaker" .)