Nurse almost guaranteed prize (8)
I believe the answer is:
treasure
'prize' is the definition.
(synonyms)
'nurse almost guaranteed' is the wordplay.
'nurse' becomes 'treas' (I can't justify this - if you can you should believe this answer much more).
'almost' means to remove the first letter.
'guaranteed' becomes 'sure' (I've seen this in another clue).
'sure' with its initial letter removed is 'ure'.
'treas'+'ure'='TREASURE'
Can you help me to learn more?
(Other definitions for treasure that I've seen before include "Robert Louis Stevenson novel" , "Accumulated riches" , "Value highly" , "Wealth and riches" , "X marks its spot!" .)