Tending to fancy Yank unclothed — mostly cool about that (10)

I believe the answer is:

chimerical

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'tending to fancy' is the definition.
I can't judge whether this definition defines the answer.

'yank unclothed mostly cool about that' is the wordplay.
'yank' becomes 'american' (I've seen this in another clue).
'unclothed' indicates the central letters.
'mostly' means to remove the last letter.
'cool' becomes 'chill' (synonyms).
'about that' indicates putting letters inside.
The centre of 'american' is 'merica'.
'chill' with its final letter taken off is 'chil'.
'merica' inserted within 'chil' is 'CHIMERICAL'.

Can you help me to learn more?

(Other definitions for chimerical that I've seen before include "Fancied" , "Wild; fanciful" .)

I've seen this clue in The Times.

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