Point in dispute remains to prosecute at law (5)

I believe the answer is:

issue

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'point in dispute' is the definition.
(I've seen this before)

'remains to prosecute at law' is the wordplay.
'remains' becomes 'is' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'to prosecute at law' becomes 'sue' (I've seen this before).
'is'+'sue'='ISSUE'

Can you help me to learn more?

(Other definitions for issue that I've seen before include "something to discuss" , "Subject to discuss" , "Come forth or bring out" , "Circulate, distribute or equip with" , "Problem < children" .)

I've seen this clue in The Telegraph.

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