H Bunty,
I think 16a should be 18a.
Do you mind parsing it? I can't see where the 'function' comes into it. Is the definition 'when hot's air's emitted'? That only works if discussion=hot air, but plenty of discussions can be short and constructive, with no hot air.
Also, I can't parse this one:
14d. Sap departs dressed in a continental fur (9).
I think it's Undermine, un is 'a continental', fur is ermine, but that leaves a 'd' I can't account for, or the 'departs dressed' in the clue.
Thanks,