Nothing well-balanced in old-style qualification (1,5)
I believe the answer is:
o level
'old-style qualification' is the definition.
(former UK educational qualification)
'nothing well-balanced' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'well-balanced' becomes 'level'.
'o'+'level'='O-LEVEL'
'in' acts as a link.
(Other definitions for o level that I've seen before include "School exam" , "Basic level of a subject in English school" , "British school examination" , "Qualification for 14-16-year-olds in the UK" .)