This crossword is really difficult or maybe I am suffering from excess chocolate consumption at easter!!!
13a. in short,any crystallised form of magnesium silicate? Alh, take a powder [4]
15a. I'm as confused as anyone who endeavours to get 27a [4]
17d. A character and I could switch for an answer that's yielding - but a grievance it is [9]
23d.17th parallel will sure go berserk[6]