Left or right sock (5)
I believe the answer is:
punch
This clue is a triple definition!
'left' is the first definition.
(thesaurus)
'or' acts as a link.
'right' is the second definition.
(thesaurus)
'sock' is the third definition.
(I've seen this before)
(Other definitions for punch that I've seen before include "box" , "Wife-beating puppet" , "Vigorous blow" , "Press" , "Tool for making a hole" .)