The Norwich loanee scored in each half – with Marlon Pack – grabbing the other as the Blues ran out 3-0 winners to extend their lead at the top to seven points.
It was driven by much-improved second-half display, with Kamara the shining star – and here are our Pompey player ratings...
5. Jack Sparkes - 7
Not too many of those testing crosses on this occasion, but always a willing outlet, was involved in the second goal and defensively sound. Photo: Jason Brown
6. Marlon Pack - 9
Comfortably the outstanding player of the first half, while his long throw provided the assist for Kamara’s goal. Then popped up to convert Lane’s left-wing cross to make it 2-0. Photo: Jason Brown
7. Joe Morrell - 8
(Replaced by Christian Saydee on 77 mins) - Always looking to up the tempo and produced one great driving run late in the first half into the opposition box. So good at making Pompey tick, yet Mousinho opted to bring him off with 13 minutes to go while on a booking. Photo: Jason Brown
8. Alex Robertson - 8
Buzzed around, always wanting the ball, always looking to create and cleverly finding pockets of space. Such a key figure for the Blues in any position. Photo: Jason Brown