DeeBee, dont think 17ac can be effect. Pretty sure 8, 13dn is square one. Then again, i could be wrong and it could be square off, which gives you your "f". Hmmm!
good shout DeeBee. square off makes sense now you've explained it. sorry to have doubted you. how did you get flower for 18dn? Strange clue structure. can see the obvious connection to 16dn but dont really get the clue. also struggling with 26ac and 22dn...