Crossword Genius

To a doctor a precious thing is the last tablet (9)

Ross

I believe the answer is:

tombstone

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

'the last tablet' is the definition.
'tombstone' can be an answer for 'tablet' (thesaurus). I'm unsure of the 'the last' bit.

'to a doctor a precious thing' is the wordplay.
'a doctor' becomes 'MB' (Bachelor of Medicine).
'a precious thing' becomes 'stone' (I can't explain this - if you can you should give a lot more credence to this answer).
'to'+'mb'+'stone'='TOMBSTONE'

'is' is the link.

Can you help me to learn more?

(Other definitions for tombstone that I've seen before include "Where to find epitaph" , "Graveyard marker" , "Last monument" , "film location" , "Does it display departure date" .)

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