I have completed this, but don't understand some answers: 7a 'Christmas in an English infirmary, (4)' which is GOSH, (Great Ormond St Hospital) but why Christmas?? Also 17a:'Trot supporting labour', which is CHILDBEARING, why does Trot mean child? And 23a: 'Lag back at 1 am, after consuming drink endlessly (8), answer INSULATE. Would be grateful for some explanations please - have only recently started doing the Times crosswords at the weekends and find them hard!