Crossing place in ruins (7)
I believe the answer is:
pelican
'crossing' is the definition.
(pelican crossing is a type of road crossing)
'place in ruins' is the wordplay.
'ruins' indicates an anagram.
'place'+'in'='placein'
'placein' with letters rearranged gives 'PELICAN'.
(Other definitions for pelican that I've seen before include "Large bird with enormous beak" , "Bird's" , "one with huge bill" , "In place (anag.)" , "Aquatic bird with pouch" .)