Go through ruined arches (6)
I believe the answer is:
search
'go through' is the definition.
(I've seen this before)
'ruined arches' is the wordplay.
'ruined' indicates an anagram.
'arches' with letters rearranged gives 'SEARCH'.
(Other definitions for search that I've seen before include "Probe" , "Comb" , "thorough examination" , "Seek (out); hunt (for)" , "Examine (to find something)" .)