Away on holiday so only just catching up.
I’ve seen elsewhere that the answer to 12ac (Say somersault) is SEASON, which I don’t get at all. It also raises a question about 6d (PO’s on bus) which I couldn’t decide on BONUS or BOSUN.
According to Chambers bosun is a foreman or warrant officer, not a petty officer.
So, why SEASON and BOSUN?