Nice not to lose everything (7)
I believe the answer is:
winsome
'nice' is the definition.
(thesaurus)
'not to lose everything' is the wordplay.
'not to lose' becomes 'win' ('win' is the opposite to 'lose').
'everything' becomes 'some' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'win'+'some'='WINSOME'
Can you help me to learn more?
(Other definitions for winsome that I've seen before include "Agreeable" , "Captivating" , "Charming, engaging" , "Holding an appeal" , "Attractive - I'm so new (anag)" .)