Egyptian cross with a top loop (4)
I believe the answer is:
ankh
'egyptian cross with a top loop' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ankh that I've seen before include "Cross with a loop at the top, symbol of life in ancient Egypt" , "Egyptian cross" , "Hank (anag) - cross symbolising eternal life" , "Sign of life" , "Egyptian hieroglyph representing life" .)