Tough as ___ (5)
I believe the answer is:
nails
(Other definitions for nails that I've seen before include "Fixing pins" , "Horny plates of the digits" , "Part of body; hard as them" , "Metal spikes" , "Tacks - arrests" .)
I believe the answer is:
nails
(Other definitions for nails that I've seen before include "Fixing pins" , "Horny plates of the digits" , "Part of body; hard as them" , "Metal spikes" , "Tacks - arrests" .)