Cabers tossed in pairs! (6)
I believe the answer is:
braces
'pairs' is the definition.
('brace' can be a synonym of 'pair')
'cabers tossed' is the wordplay.
'tossed' indicates an anagram.
'cabers' anagrammed gives 'BRACES'.
'in' is the link.
(Other definitions for braces that I've seen before include "Stabilises" , "Supports for teeth or trousers" , "Appliances to correct dental irregularities" , "Straps used to keep trousers up" , "Tighten" .)