Broadcaster’s japes about king’s high offices (11)

I believe the answer is:

skyscrapers

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'high offices' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps you can see a link between them that I can't see?

'broadcaster's japes about king's' is the wordplay.
'broadcaster's' becomes 'sky's' (Sky is a broadcast TV channel).
'japes about' becomes 'crap' (I can't explain this - if you can you should give a lot more credence to this answer).
'king's' becomes 'ER's' (abbreviation for Edward Rex, various English kings).
'skys'+'crap'+'ers'='SKYSCRAPERS'

Can you help me to learn more?

(Other definitions for skyscrapers that I've seen before include "Notable feature of Chicago" , "Tower blocks" .)

I've seen this clue in The Sunday Times.

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