Fight and fight again, nothing less (5)
I believe the answer is:
foray
'less' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'fight and fight again nothing' is the wordplay.
I cannot quite understand how this works, but
'nothing' could be 'o' (looks like zero - 0) and 'o' is found within the answer.
'fight' could be 'fray' (fray is a kind of fight) and 'fray' is located in the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for foray that I've seen before include "Depredation" , "Raid into enemy territory" , "Raid or incursion" , "Sortie" , "Brief incursion" .)