Hi Mondrian,
Bees has given you a very strong hint for 13d and, as I have the advantage of having a copy of Jeff Evans' 'The Penguin TV Companion', I can tell you that the cartoon was shown on BBC1 in 1963 and 1964.
As far as 1d is concerned, yes, you're right with the river. Now suppose I was to add that the next part of the answer is a three-letter synonym for a period of time... You will quickly come to the conclusion that the third part of the answer is a three-letter synonym for 'guy'. Got it? I thought you might.
With best wishes,
Caravaggio