Cruelly fed tramp a choking hazard (9)

I believe the answer is:

afterdamp

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'choking hazard' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'cruelly fed tramp a' is the wordplay.
'cruelly' is an anagram indicator (I've seen this in other clues).
'fed'+'tramp'+'a'='fedtrampa'
'fedtrampa' is an anagram of 'AFTERDAMP'.

Can you help me to learn more?

(Other definitions for afterdamp that I've seen before include "mining hazard" , "Dangerous atmosphere" , "CO2 released in mines; famed part (anag.)" .)

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