Open, or not drawn (6)

I believe the answer is:

untied

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'open' is the definition.
Both the definition and answer are adjectives. Maybe there's a link between them I don't understand?

'not drawn' is the wordplay.
'not' becomes 'un' (I've seen this in other clues).
'drawn' becomes 'tied' ('tie' can be a synonym of 'draw'**).
'un'+'tied'='UNTIED'

'or' is the link.

Can you help me to learn more?

(Other definitions for untied that I've seen before include "Unfastened, unlaced" , "No longer bound" , "Disconnected" , "Lacking any fetters" , "Loosened" .)

I've seen this clue in the Evening Standard.

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