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