No deal, I guess! (5)

I believe the answer is:

opine

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'i guess' is the definition.
'opine' can be an answer for 'guess' (I've seen this in another clue). I am not certain of the 'i' bit.

'no deal' is the wordplay.
'no' becomes 'O' (O resembles 0).
'deal' becomes 'pine' (deal can mean wood for building with eg pine).
'o'+'pine'='OPINE'

Can you help me to learn more?

(Other definitions for opine that I've seen before include "Express a point of view" , "Conjecture" , "State one's held view" , "Give opinion" , "Think - express a view" .)

I've seen this clue in the Evening Standard.

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