Safer net designed for catch, say? (8)
I believe the answer is:
fastener
'catch say?' is the definition.
(catch is a kind of fastener)
'safer net designed' is the wordplay.
'designed' is an anagram indicator (designed with the letters).
'safer'+'net'='safernet'
'safernet' with letters rearranged gives 'FASTENER'.
'for' is the link.
(Other definitions for fastener that I've seen before include "Fixer, securer" , "Clip, catch, etc" , "Securing clip" , "It could secure" , "Stud perhaps" .)