Examine closely for fallen arches (6)
I believe the answer is:
search
'examine closely' is the definition.
(I've seen this before)
'fallen arches' is the wordplay.
'fallen' indicates anagramming the letters.
'arches' with letters rearranged gives 'SEARCH'.
'for' acts as a link.
(Other definitions for search that I've seen before include "Seek (out); hunt (for)" , "Look carefully (for)" , "Look thoroughly to find something" , "Comb" , "Fish about" .)