For instance, in modern times, we no longer say it (4)
I believe the answer is:
egad
'times we no longer say it' is the definition.
I can't tell whether this defines the answer.
'for instance in modern' is the wordplay.
'for instance' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'in modern' becomes 'ad' (I've seen this in other clues. I am not sure about the 'in' bit.).
'eg'+'ad'='EGAD'
Can you help me to learn more?
(Other definitions for egad that I've seen before include "Christ" , "Archaic exclamation of surprise" , "Mild oath - aged (anag)" , "Old oath" , "Archaic expression of anger, surprise, etc" .)