Catastrophic matter put before specialist for remedy (9)
I believe the answer is:
treatment
'remedy' is the definition.
(I've seen this before)
'catastrophic matter put before specialist' is the wordplay.
'catastrophic' indicates an anagram.
'put before' says to put letters next to each other.
'specialist' becomes 'ent' (Ear, Nose and Throat specialist).
'matter' anagrammed gives 'treatm'.
'treatm'+'ent'='TREATMENT'
'for' is the link.
(Other definitions for treatment that I've seen before include "See 41 Down" , "Maintenance work" , "Action to help" , "Handling - therapy" , "course of drugs" .)