Am I being a pedant? A customer (as in 9D estate agent's cutomer) is '
a person who purchases goods or services from another' When you buy a house the seller is the estate agent's customer.....ie the seller pays the bill.
And 19A, answer = you're on!.....when were apostrophied 'words' allowed?? I see them as a convenient joining of 2 words....but not really a word in it's own right for a crossword.
Oh, and everything was better in 1975! Humph.