Father Time stops glib talk (6)
I believe the answer is:
patter
'glib talk' is the definition.
(I've seen this before)
'father time stops' is the wordplay.
'father' becomes 'pater' (old-fashioned term for father).
'time' becomes 't' (abbreviation).
'stops' means one lot of letters goes inside another (to stop can mean to block a gap).
'pater' placed around 't' is 'PATTER'.
(Other definitions for patter that I've seen before include "Sound of quick light taps, rain or little feet" , "Run with light steps" , "Rapid and glib speech, perhaps for sales" , "Rapid and glib talk" , "Comedian's rapid jokes" .)