Crossword Genius

Twisted of friend to dispose of a distinctive building (5)

Ross

I believe the answer is:

folly

I'm a little stuck... Click here to teach me more about this clue!

'distinctive building' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

'twisted of friend to dispose of a' is the wordplay.
'twisted' says the letters should be written in reverse.
'friend' becomes 'ally' (an ally is a friend or supporter).
'to dispose of' indicates named letters should be taken away.
'of' written backwards gives 'fo'.
'ally' with 'a' taken out is 'lly'.
'fo'+'lly'='FOLLY'

Can you help me to learn more?

(Other definitions for folly that I've seen before include "Stupidity - false building" , "Fatuity" , "'Madness, stupidity (5)'" , "mock Gothic building" , "Silliness - stupid mistake" .)

I've seen this clue in The Independent.
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