Binding disc inside inserted tube (9)
I believe the answer is:
stringent
'binding' is the definition.
(thesaurus)
'disc inside inserted tube' is the wordplay.
'disc' becomes 'ring'.
'inside' indicates putting letters inside.
'inserted tube' becomes 'stent' (medical tube).
'ring' going inside 'stent' is 'STRINGENT'.
(Other definitions for stringent that I've seen before include "Demanding, inflexible" , "Uncompromising" , "Strict, precise, exacting" , "tightly drawn" , "(Rule) allowing no discretion" .)