Bored about wife's ostentatious display (5)
I believe the answer is:
swank
'display' is the definition.
(swanking is a kind of displaying)
'bored about wife's' is the wordplay.
'bored' becomes 'sank' (I am not sure about this - if you are sure you should believe this answer much more).
'about' means one lot of letters goes inside another.
'wife' becomes 'w'.
'sank' going around 'w' is 'SWANK'.
'ostentatious' acts as a link.
This may not be right. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for swank that I've seen before include "Show off (colloq.)" , "Boast" , "Pretentious person" .)