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Think I have the overall theme, but struggling with some of the cluing:
11a Challenge no longer includes navy helicopter from Hawaii approaching date line (10, two words) ?INH??????
10d Endlessly brightens don involved in removal of loyal person (10) D???????N?
33a 40% of people of the same age lost glasses (6) ??NE??
There could be a misprint in the definition.
Any hints appreciated.

10d dethroning - anagram of (B)righten(S) + don

Thanks scarlet - could kick myself

11a, VINHO VERDE, N+HOVER+D in VIE, misprint Line = Wine

33a, GENERA(tion), misprint Glasses = Classes

Thanks Kilgore trout - this is a big help moving me along