DURE an old variation of endure, YU is jade. 16 and 22 are type B, 17 is quite a difficult clue, the letters of the answer and 'horses' make up the same letters as Yorkshire use, the whole thing being another word for itchier. 18 is a synonym for nosey, did well against the Red Baron. 19 is E, CY with a word for best enclosed, 20 replaces W in a word for modest by RD, 21 is anagram of m and yodel, 23 the definition is fluttering dry fruit, 24 is a roofer, 25 PETER is a prison cell, 27 Croatia is HR, everything in the wordplay is reversed.