Crossword Genius

Nothing in striking description that's solid? (3-3)

Ross

I believe the answer is:

all-out

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

'nothing in' is the definition.
Both the answer and definition are adjectives. Perhaps you can see an association between them that I can't see?

'striking description that's solid?' is the wordplay.
I cannot quite understand how this works, but
'striking' could be 'out' (striking out is a common phrase) and 'out' is located in the answer.
The remaining letters 'all' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for all-out that I've seen before include "Using full strength or energy - nobody home?" , "Thorough-going" , "Complete" , "Whole-hearted (effort)" , "Using every resource" .)

I've seen this clue in The Guardian.
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