Crossword Genius

Undecided where to put creosote? (2,3,5)

Ross

I believe the answer is:

on the fence

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

'undecided' is the definition.
Both the definition and answer are adjectives. Maybe you can see a link between them that I don't see?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for on the fence that I've seen is " unwilling to commit oneself".)

I've seen this clue in The Independent.
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