Now so upset as to fall in a faint! (5)

I believe the answer is:

swoon

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

'a faint' is the definition.
(I know that faint can be written as swoon)

'now so upset' is the wordplay.
'upset' indicates an anagram.
'now'+'so'='nowso'
'nowso' is an anagram of 'SWOON'.

'as to fall in' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for swoon that I've seen before include "Lose consciousness" , "Display of extreme emotion" , "Fall fainting" , "Show ecstasy" , "experience ecstasy" .)

I've seen this clue in the Evening Standard.

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