Crossword Genius

The yelling from below, object about (10)

Ross

I believe the answer is:

thundering

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

'the yelling from' is the definition.
I can't judge whether this definition defines the answer.

'below object about' is the wordplay.
'below' becomes 'under' (synonyms).
'object' becomes 'thing' (an object is a thing or item).
'about' is an insertion indicator.
'under' placed into 'thing' is 'THUNDERING'.

Can you help me to learn more?

(Other definitions for thundering that I've seen before include "Making a loud noise" , "Tremendous" .)

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