Strange laws on hand tools (4)
I believe the answer is:
awls
'hand tools' is the definition.
(awl is a kind of hand tool)
'strange laws' is the wordplay.
'strange' indicates an anagram.
'laws' with letters rearranged gives 'AWLS'.
'on' acts as a link.
(Other definitions for awls that I've seen before include "Laws about boring tools (4)" , "Small piercing tools" , "Tools for punching small holes" , "Pointed hand-tools" .)