Actor Garbo walloped, beginning to tease (6)
I believe the answer is:
bogart
'actor' is the definition.
(Bogart is an example)
'garbo walloped beginning to tease' is the wordplay.
'walloped' is an anagram indicator (I've seen 'wallop' mean this).
'beginning to' suggests taking the first letters.
The initial letter of 'tease' is 't'.
'garbo' is an anagram of 'bogar'.
'bogar'+'t'='BOGART'
(Other definitions for bogart that I've seen before include "Lauren Bacall's first actor husband, d. 1957" , "Famous player" , "Humphrey --, US film actor" , "See 12" , "American actor" .)