Loud thing cat may do? Here’s a reminder (9)
I believe the answer is:
flashback
'a reminder' is the definition.
(a reminder of earlier scenes in TV)
'loud thing cat' is the wordplay.
'loud' becomes 'flash' (synonyms).
'thing cat' becomes 'back' (I can't explain this - if you can you should believe this answer much more).
'flash'+'back'='FLASHBACK'
'may do? here's' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
(Other definitions for flashback that I've seen before include "Unexpected but vivid recall of a past experience" , "Sudden recall" , "Echo of the past" , "Past scene inserted into a film's chronology" , "(In film or novel) return to a previous event or period" .)