Bound together? Slice knot in pieces (5-4)
I believe the answer is:
close-knit
'bound together?' is the definition.
(I've seen this before)
'slice knot in pieces' is the wordplay.
'in pieces' indicates an anagram.
'slice'+'knot'='sliceknot'
'sliceknot' with letters rearranged gives 'CLOSE-KNIT'.
(Other definitions for close-knit that I've seen before include "Tightly bound together" , "Thick" , "Intimate as a group" , "No tickles, being woven tightly" , "United or joined together - with wool?" .)