Crossword Genius

Encourages about bomb containers (9)

Ross

I believe the answer is:

eggshells

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'containers' is the definition.
Although both the answer and definition are plural nouns, I cannot understand how one could define the other.

'encourages about bomb' is the wordplay.
'encourages' becomes 'eggs'.
'about' indicates putting letters inside.
'bomb' becomes 'shell' (shelling is a kind of bombing).
'eggs' placed around 'shell' is 'EGGSHELLS'.

Can you help me to learn more?

(Other definitions for eggshells that I've seen before include "Tip-toe gently like walking on ........." , "They're hard to hold yolks" , "Walk delicately as if on these" , "See 1" .)

I've seen this clue in the Sydney Morning Herald.
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