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36d(5),Clue,"Member of a body of Polish Lancers".I believe it is "ULAN"with 4 letters?Can you spell it another way?
24d(6&3),Clue,"Biennial golf tournament between Gt.Britain,Ireland & the U.S.A".Again I think it is the Solheim(Cup)but that is 7 letters not 6? Is it me??!!
Finally,23a(13&6),Clue,"The escape velocity of an object is the speed of light if all the object`s mass is contained in this" I have,"-C---R-S-H-L- R-D-U- " All help gratefully acknowledged.

Think it can be Uhlan

23 Schwarzschild radius

critical radius or similar term

Walker Cup

Thank`s"Rosalind" I`ll go with UHLAN.
"Mamya",WOW!!Do I feel inferior! Thankyou.
"dunderhead"thank`s for your assistance.
HAPPY NEW YEAR TO YOU ALL!
"DUKEY"