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