Centre in Zurich checks fastenings (6)
I believe the answer is:
rivets
'fastenings' is the definition.
(rivet is a kind of fastening)
'centre in zurich checks' is the wordplay.
'centre in' indicates the central letters.
'checks' becomes 'vets' (I've seen this before).
The central letters of 'zurich' are 'ri'.
'ri'+'vets'='RIVETS'
(Other definitions for rivets that I've seen before include "Short metal pins" , "Steel pins holding metal sheets together" , "Metal pins or bolts for holding together two plates of metal" , "Small pins for joining metal sheets" .)