Crossword Genius

To doctors they're grave situations (5)

Ross

I believe the answer is:

tombs

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'grave situations' is the definition.
Although both the answer and definition are plural nouns, I don't see how one could define the other.

'to doctors' is the wordplay.
'doctors' becomes 'MBs' (Bachelors of Medicine).
'to'+'mbs'='TOMBS'

'they're' acts as a link.

Can you help me to learn more?

(Other definitions for tombs that I've seen before include "Evidence of failure" , "monuments" , "Sepulchres" , "Places of burial" .)

I've seen this clue in The Globe and Mail.
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