Having no weapons and lacking ability to punch, say? (7)
I believe the answer is:
unarmed
I believe this is a double definition.
'having no weapons' is the first definition.
(I've seen this before)
'lacking ability to punch say?' is the second definition.
(ie literally without arms)
'and' is the link.
(Other definitions for unarmed that I've seen before include "Having no means of defence" , "having lost certain members" , "Not bearing a weapon" , "Maunder along without weapons" , "Defenceless" .)