I used my (now discontinued) Sympathy program to search for an anagram of the 5 circled letters plus 4 or 5 extra letters, That got me home. Wouldn't have got it for a long time otherwise.
It helped that I knew Malva's preference when it comes to themes. I've found most of his puzzle to be light relief in the past, but didn't think this one was easy at all - but still very enjoyable.