Decline in W1: left drunk outside (8)

I believe the answer is:

twilight

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'decline' is the definition.
(I know that twilight is a type of decline)

'w1 left drunk outside' is the wordplay.
'ww' becomes 'wi' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'left' becomes 'L' (common abbreviation).
'drunk' becomes 'tight' (I've seen this in other clues).
'outside' indicates putting letters inside.
'wi'+'l'='wil'
'wil' put inside 'tight' is 'TWILIGHT'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for twilight that I've seen before include "Illumination at dusk" , "Vampire book" , "when it gets dark" , "Period of illumination when sun is just below horizon" , "Period just after sunset, becoming dark" .)

I've seen this clue in The Sun.

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