She has nothing to exist for (5)
I believe the answer is:
olive
'she' is the definition.
(I've seen this before)
'nothing to exist for' is the wordplay.
I cannot really understand how this works, but
'nothing' could be 'o' (O resembles 0) and 'o' is found within the answer.
'exist' could be 'live' (synonyms) and 'live' is located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'has' acts as a link.
Can you help me to learn more?
(Other definitions for olive that I've seen before include "Source of edible oil" , "Tree - shade of green" , "Mediterranean fruit or greenish colour" , "Green shade; its branch for peace" , "A Med. fruit-tree" .)