Oddly after wins, King vulnerable (2,4)
I believe the answer is:
at risk
'vulnerable' is the definition.
(I've seen this before)
'oddly after wins king' is the wordplay.
'oddly' means one should take alternating letters.
'king' becomes 'k'.
'after'+'wins'='afterwins'
The alternate letters of 'afterwins' are 'atris'.
'atris'+'k'='AT RISK'
(Other definitions for at risk that I've seen before include "Endangered" , "Exposed to danger" , "Vulnerable" .)