Bumper Crossword.

[Bernie]

I'm nearly there.
3d. Doctor swallowed by fish in the frozen wastes(6)t?n ?r?
16a. A short period on duty that gives time to a canine(3,5)dog ?a?c?
37d.Fly here? Then fly no more!(3)?e?
33d MEP Alex is confused for instance (7) E?a????
42d.Point to a toxic mixture as being alluring(6)E?????
50a.Cue to be given at once (6)p?????
57a. Peacekeepers have to cut back on 112a (6)?0????
112a. At first I can espy diamonds (3)i?e
114a Old directions to the longest river(6)s???l?
110d. The Reality is that this is the location of AC(2,4) S? ??l?
These are the last few which I have thought over for a long time with no luck.
Many thanks for any help

[Tilly2]

3d tundra

[Sam1960]

16. dog watch

[Captain2]

114 SE-Nile

[Captain2]

112 Ice - initial letters of words in clue

[Sam1960]

33. example (anag)

[Tilly2]

112a ice

[Captain2]

50 prompt

[Captain2]

42 E-xotic

[Tilly2]

33d example

[Captain2]

57 Pol-ice (lop/cut reversed)

[Captain2]

Don't suppose we have any more letters for 37d and 110d, do we Bernie?

[Bernie]

37a. Mass with the cardinal and a rowing crew(6)?e?g?t. Wondering if answer is(w)eight.
If that is correct 37d (3) would be we?
110d I have ?n ?a?t. I am wondering if it could be in fact

[Sam1960]

37. web ?

[Bernie]

Many thanks to you all for your help.Finished at last.!!

[Captain2]

Just back from my evening walk.

Yes, 'In fact' for 110d the location of AC is in 'in fACt'

well done on finishing.