Many thanks baitress, but the two anwers don't gel - I have come to the conclusion that 13 down is 'mass' which would team up with the shaded 'media'. i agree with 'egoist. I will now investicate 'mass culture'. Have a good day!
Many thanks catron and apologies to baitress. I can see that I have mis-read 13 & 18. Remarkably I have to go for an eyesight test this morning - not before time it would seem.