jono:  16 see above #4.  18d - def is an old sailor's term for port (not as in harbour);  wordplay - common word for fat around a (male) second part of 8.  7/25 - I think the second part is a theme-word and the first is a bird, but I haven't deciphered the lark bit, though if I'm right the whole thing is a kind of jerky movement.