Crossword Genius

Not yet decided to start (4)

Ross

I believe the answer is:

open

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

'start' is the definition.
(I know that open is a more specific form of the action start)

'not yet decided' is the wordplay.
'not' becomes 'o' (I've seen this in other clues).
'yet decided' becomes 'pen' (I can't justify this - if you can you should believe this answer much more).
'o'+'pen'='OPEN'

'to' is the link.

Can you help me to learn more?

(Other definitions for open that I've seen before include "Not secret or hidden" , "Ready for business; spread out; manifest" , "Willing" , "Frank and unlocked" , "Allowing entry and exit" .)

I've seen this clue in The Globe and Mail.
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