Metal fasteners (4)
(Other definitions for snaps that I've seen before include "Breaks in two" , "Breaks suddenly" , "Photos" , "Breaks under tension" , "Informal photographs" .)
'metal fasteners' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for nails that I've seen before include "Horny plates of the digits" , "Metal fasteners" , "Tacks - arrests" , "Fastens with spikes" , "Cock's crest" .)
'metal fasteners' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rivets that I've seen before include "Short metal pins" , "Steel pins holding metal sheets together" , "Small pins for joining metal sheets" , "Metal pins or bolts for holding together two plates of metal" .)
(Other definitions for pins that I've seen before include "With needles, they create a tingling sensation" , "Wire fasteners" , "security codes" , "Stocking fillers" .)