I can't help feeling there are two answers out there ofr 96 - mine is an obscure alternative spelling for a more well known word, which only seems to be in Chambers, but fits the clue.
For 79, thanks for hints - I can see an answer which fits residue in a glass and extremities, but why '...but this is all there is'?
Is anyone else unhappy with 'On one's toes' for 80? It seems too imprecise for such pernickety setters!