After emergency exits cleared, head off to find visor (8)
I believe the answer is:
eyeshade
'visor' is the definition.
(synonyms)
'after emergency exits cleared head off' is the wordplay.
'after emergency' becomes 'ey' (I can't justify this - if you can you should believe this answer much more).
'cleared' says to hollow out the word (remove centre letters) (the inside letters are cleared out).
'off' is an anagram indicator.
'exits' with its centre taken out is 'es'.
'head' with letters rearranged gives 'hade'.
'ey'+'es'+'hade'='EYESHADE'
'to find' acts as a link.
(Other definitions for eyeshade that I've seen before include "Sight protector" , "screen for lookers in The Sun" , "Sun visor" , "Visor to protect from strong light" , "guard" .)