Less important matter team is to prosecute (4,5)

I believe the answer is:

side-issue

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'less important matter' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'team is to prosecute' is the wordplay.
'team' becomes 'side' (both can mean a sports team).
'to prosecute' becomes 'sue' (I've seen this in another clue).
'side'+'is'+'sue'='SIDE-ISSUE'

Can you help me to learn more?

(Other definitions for side-issue that I've seen before include "Not the main topic, a marginal one" , "Subsidiary topic" , "Subordinate matter" .)

I've seen this clue in The Telegraph.

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