I Prize Cryptic Crossword No 1092

[souxie]

1 Across, Moved like a sea round fish, one that's extra powerful (12)
8 Across, Tree encircling it is supporting the best (7)
9 Across, Old cunning Bill will seize one (7)
11 Across, Touched, then, excited, becoming more tense (7)

Sorry about the lack of letters

Many thanks in advance

[bibblebub]

8a: elitism
9a: archaic

[bibblebub]

11a: tighten

[scorpiojo]

1 su perch a rged

[souxie]

Many thanks to you both.

[michelangelo]

Any ideas please for 26 ac: Sense opening for haggling after disappointment in contract (4, 4, 4)
I have ?o?e/?o?n/?i?h
Many thanks in advance

[scorpiojo]

Come down with

[scorpiojo]

^ as in contract (an illness) - can't parse though :(

[michelangelo]

Thank you, Scorpio. My best guess was the same, but like you, I cannot parse it.

[scorpiojo]

Welcome

[shaneystar2]

disappointment = come down
sense = wit plus opening letter of haggling H

[michelangelo]

Many thanks shaneystar2 for explanation.