Beat and possibly harm me (6)
'beat' is the definition.
(hammering is a kind of beating)
'possibly harm me' is the wordplay.
'possibly' is an anagram indicator.
'harmme' anagrammed gives 'HAMMER'.
'and' acts as a link.
(Other definitions for hammer that I've seen before include "Utterly defeat", "Tool - trounce", "it's to be launched in 8 [HIGHLAND GAMES]", "thus deformed toe", "Come under the . . . . . . - be for sale at auction".)