Producing a lot of fear? Very much (10)

I believe the answer is:

dreadfully

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'producing a lot' is the definition.
I can't tell whether this defines the answer.

'fear? very much' is the wordplay.
'fear?' becomes 'dread' (dread is a kind of fear).
'very much' becomes 'fully' (I can't explain this - if you can you should give a lot more credence to this answer).
'dread'+'fully'='DREADFULLY'

'of' is the link.

Can you help me to learn more?

(Another definition for dreadfully that I've seen is " Far from well".)

I've seen this clue in The Everyman puzzle in The Observer.

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