Think nothing long (5)

I believe the answer is:

opine

'think' is the definition.
(I know that think can be written as opine)

'nothing long' is the wordplay.
'nothing' becomes 'O' (O resembles 0).
'long' becomes 'pine' (to pine for someone is to long for them).
'o'+'pine'='OPINE'

(Other definitions for opine that I've seen before include "State as one's opinion" , "judge" , "Say what one thinks" , "Think - express a view" , "Believe" .)

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

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