Crossword Genius

Left first three letters and a ring at a medical smock (3,4)

Ross

I believe the answer is:

lab coat

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

'a medical smock' is the definition.
'lab coat' can be an answer for 'smock' (I've seen this in another clue). I am unsure of the 'a medical' bit.

'left first three letters and a ring at' is the wordplay.
'left first' becomes 'l' (ast letter of 'left').
'three letters' becomes 'abc' (I can't justify this - if you can you should give a lot more credence to this answer).
'and' is a charade indicator (letters next to each other).
'a ring' becomes 'o' (letter resembling a ring).
'l'+'abc'+'o'+'at'='LAB COAT'

Can you help me to learn more?

(Another definition for lab coat that I've seen is " Scientist's protective clothing (abbr)".)

I've seen this clue in the Sydney Morning Herald.
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