Appalling child read full extract (8)

I believe the answer is:

dreadful

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

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

'child read full extract' is the wordplay.
'DREADFUL' is hidden in amongst the letters.
However, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for dreadful that I've seen before include "Horrible, shocking" , "Extremely bad or disagreeable" , "Shockingly bad" , "Atrocious, awful" , "Terrible" .)

I've seen this clue in The Sun.

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