20A. Skips through ballroom, it seems - ?M?T?
21A. Fortified white wine - ?A?E?R?
27A. Cause of blurred vision - ?S?I???T?S?
33A. Vegetation to increase, prepare to operate -S?R??- UP
36D. Abandoned community - G?N??- O??
30D. Clear the sailor must find the answer -???O?V?
34D. Kitty in water -P?O?
55A. Make a dash for the hay pen - ?Y???????
39D. Sarcastic article extracted from a newspaper -?U???N?
As you can see, the brain has failed today. Thanks to all who answer - Hoaroak
20a "...ballro OM IT S eems"
21a Madeira
27a Astigmatism
33a Scrub up
36d Ghost town
30d AB-solve
34d Pool - double meaning
55a Hyphenate - anag 'the hay pen'
39d Cutting - double meaning
Thank you everybody for your help. Thanks for the long list of answers Lie-in-King. I have just found some more questions and then I must get on with supper
Hoaroak