How one can describe Pinocchio or Dopey (12)

I believe the answer is:

woodenheaded

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'how one' is the definition.
The answer and definition are different parts of speech. However, adjectives and past participle verbs sometimes define each other.

'can describe pinocchio or dopey' is the wordplay.
I cannot really see how this works, but
'can' could be 'head' (head is a kind of can) and 'head' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Sunday Times and The Times.

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