Crossword Genius

We opined it may be vulnerable (4,4)

Ross

I believe the answer is:

wide open

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

'vulnerable' is the definition.
(I've seen this before)

'we opined it may be' is the wordplay.
'we' becomes 'w' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'it' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'may be' indicates an anagram.
'opined'+'e'='opinede'
'opinede' anagrammed gives 'ideopen'.
'w'+'ideopen'='WIDE-OPEN'

Can you help me to learn more?

(Other definitions for wide open that I've seen before include "Gaping" , "Vulnerable to attack" , "with unpredictable outcome" .)

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