It looked as though a shock could be on the cards when Danny Andrew's header gave the U's a 38th-minute lead.
However, Pompey got back on terms just before the break. Kusini Yengi was fouled in the box on 44 minutes and then stuck away the resulting penalty.
Brentford loanee Myles Peart-Harris produced a low finish to give Portsmouth the lead just before the hour mark and the points were in the bag when Abu Kamara curled home a superb angled effort on 71 minutes.
Mousinho said: "I'm really pleased to get all three points - and I think the overall performance meant we deserved them.
This story is from the February 18, 2024 edition of The Football League Paper.
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This story is from the February 18, 2024 edition of The Football League Paper.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
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