8 'original' = UR (the original city) + SA(r) is the Scots for 'savour' [extra 'r'].
21 'game'/lame is the anagram indicator for 'in s[h]orter' with [h] extra.
1a is a thematic answer, hankir -
'rapid' is the def and it refers to the watery kind (usually pluralised as rapids) it's a 5 letter answer for the def but the wordplay gives the full entry (the other word for your 'umbrella' synonym) 'knock echoed' gives the first 3 letters of your answer followed by the usual 3 letters for 'one' with a wooden shed for the 'building' inside [the last 5 letters = the def and the first 4 letters is the thematic currency].
Sorry this is so wordy, hankir!
Thanks ProfessorM.
I was out all day.
Last 5 is Rapid.
First 4, a Turkish coin.
46a has pigeon and piglet around a coin.
So now to solve the second type. When something is taken out.
You've probably finished it, hankir - but, if you're having any doubts, most of the deletions occur at the starts or ends of answers (the exception is at 4d).