Some bank hold-up makes Egyptian cross (4)
I believe the answer is:
ankh
'egyptian cross' is the definition.
(I've seen this before)
'some bank hold-up' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'ANKH' is hidden in the letters of 'bank hold up'.
'makes' is the link.
(Other definitions for ankh that I've seen before include "Waylay" , "Hank (anag) - cross symbolising eternal life" , "Sign of life" , "Ancient Egyptian symbol of life - khan (anag)" , "Egyptian hieroglyph representing life" .)