Crossword Genius

Pack including second two cards — one's worn (7,6)

Ross

I think it could be either:

Which length description are you looking for?:

7

7,6

'worn' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

'pack including second two cards one's' is the wordplay.
I cannot really understand how this works, but
'second' could be 'mo' (both are short periods of time) and 'mo' is present in the answer.
'one' could be 'i' (Roman numeral) and 'i' is found within the answer.
This explanation may well be incorrect...

(Other definitions for smoking that I've seen before include "Using tobacco" , "unhealthy habit" , "Having a cigarette" , "Emitting a cloud of gas" , "Puffing a fag" .)

I've seen this clue in The Guardian.
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