Having views about describing birds without wings? (9)

I believe the answer is:

opinioned

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

'birds without wings?' is the definition.
I can't tell whether this definition defines the answer.

'having views about' is the wordplay.
I cannot quite understand how this works, but
'about' could be 'on' (as in a book 'on' a certain topic) and 'on' is found within the answer.
This explanation may well be incorrect...

'describing' is the link.

Can you help me to learn more?

I've seen this clue in The Guardian.

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