Christmas Crossword- Spectator ( A Final Hurdle...)

[Matakari]

Good morning, the Unclueds are falling neatly into place, but I’m not out of the woods yet. I still have six to deal with and would like confirmation for the letters I already have. Many thanks in advance!
17a ?NNO?
19a ?AEA?
43a ?ON?AD ( Looks like Conrad…)
99a  ?A?C?S?R?S?E?H?CK
48d S?A?I?
53d  ?I?O

40a Fish, swimming back from the bottom of the world? (5)
Thanks for the hint “reversal of a part of the world”. If I knew this part of the world I might be better off.

And an answer to this tricky one should help take me to the finishing line, thanks again!

4 In hospital turning up to anoint old woman (6) : HA?EN?

[roslyn251254]

17a 6 letters not 5...she goes with 39d

19a middle letter is wrong (20d is a tree)

43a YES

99a your E is wrong...81d is an anagram

48d yes...goes with 19a

53d yes....that's the singleton answer

 

 

 

[roslyn251254]

40a you want the opposite of the North pole!!  ...reversed...4. your A is wrong...13a is a 4 letter word for only with is(one') inside...H for hospital + 5 letter synonym for anoint reversed

[Neveracrossword]

Oh dear, Matakari - sorry to see you're still battling with this one. Sorry my hints weren't much use, I will try to make them bigger next time! 

[quinol]

mail online is useful for the unclueds once you know the connection, moet are there

[Matakari]

Many thanks, Roslyn251254, NACW, Quinol, for your great help! I enjoyed this Fieldfare's offering immensely. Just one Unclued eludes me, the singleton,
53d ?I?O
And a confirmation for 4d HELENA ( I noticed the variant spelling for “anele” and wondered.)

[Neveracrossword]

Oh, glad you enjoyed it immensely, Matakari - you had so many problems with it, I thought you'd be complaining!

53 Dido.