Outmoded exclamation or, for example, advert (4)
I believe the answer is:
egad
'outmoded exclamation' is the definition.
'egad' can be an answer for 'exclamation' (I have seen 'Archaic exclamation ' mean 'egad' so perhaps 'exclamation' could also mean 'egad'). I am not certain of the 'outmoded' bit.
'for example advert' is the wordplay.
'for example' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'advert' becomes 'ad' (synonyms).
'eg'+'ad'='EGAD'
'or' acts as a link.
Can you help me to learn more?
(Other definitions for egad that I've seen before include "Archaic expression of anger, surprise, etc" , "Old exclamation; aged (anagram)" , "Mild oath - aged (anag)" , "Mild oath (archaic)" , "Forgotten curse" .)