Crossword Genius

Devices hidden in satchel terrorise those in reinforced, underground chamber? (4,7)

Ross

I believe the answer is:

bomb shelter

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

'chamber?' is the definition.
(I know that bomb shelter is a type of chamber)

'devices hidden in satchel terrorise those in reinforced underground' is the wordplay.
I cannot really see how this works, but
'devices' could be 'bombs' (bomb is a kind of device) and 'bombs' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Irish Times.
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