Landlord home contents in B&B that might blow up (6,4)

I believe the answer is:

letter bomb

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'might blow up' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'landlord home contents in bb' is the wordplay.
'landlord' becomes 'letter' (landlords let property).
'home contents' becomes 'om' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'om' placed into 'bb' is 'bomb'.
'letter'+'bomb'='LETTER-BOMB'

'that' acts as a link.

Can you help me to learn more?

(Other definitions for letter bomb that I've seen before include "Shocking missive!" , "Dangerous post" .)

I've seen this clue in The Guardian.

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