Admission made by litigator tackling small problem (5)

I believe the answer is:
issue
'problem' is the definition.
(issue can mean a problem or difficulty)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for issue that I've seen before include "One's offspring" , "Instalment" , "Point in dispute" , "Children; put out" , "Children, edition" .)
