Section of quaysides Palermo erected are out of date (7)
I believe the answer is:
elapsed
'out of date' is the definition.
(something which has elapsed is out of date)
'section of quaysides palermo erected' is the wordplay.
'section of' says the answer is hidden in the clue.
'erected' is a reversal indicator (in a down clue, letters go up).
'despale' is hidden within 'quaysides palermo'.
'despale' written backwards gives 'ELAPSED'.
'are' acts as a link.
(Other definitions for elapsed that I've seen before include "slipped away" , "Went by" , "Pleased (anag.)" , "Expired" , "Pleased to have passed" .)