Looking miserable, having been confronted for ages (4-5)
I believe the answer is:
long-faced
'looking miserable' is the definition.
'confronted for ages' is the wordplay.
'confronted' becomes 'faced' (I've seen this before).
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'ages' becomes 'long'.
'faced' after 'long' is 'LONG-FACED'.
'having been' 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 long-faced that I've seen before include "Dismal looking" , "Dismal-looking and down in the mouth" .)