Worn down, having nothing for new beginning (6,4)
I believe the answer is:
ground zero
'new beginning' is the definition.
The definition suggests a singular noun which matches the answer.
'worn down having nothing' is the wordplay.
'worn down' becomes 'ground' (ground down).
'having' means one lot of letters go next to another.
'nothing' becomes 'zero' (synonyms).
'ground'+'zero'='GROUND ZERO'
'for' acts as a link.
Can you help me to learn more?
(Another definition for ground zero that I've seen is " brand new start".)