Medic in A&E beginning to read warning sign (5)

I believe the answer is:

amber

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'warning sign' is the definition.
'amber' can be an answer for 'warning' (amber traffic light). I am not certain of the 'sign' bit.

'medic in ae beginning to read' is the wordplay.
'medic' becomes 'MB' (Bachelor of Medicine).
'in' means one lot of letters goes inside another.
'beginning to' indicates taking the first letters.
The first letter of 'read' is 'r'.
'mb' placed within 'ae' is 'ambe'.
'ambe'+'r'='AMBER'

Can you help me to learn more?

(Other definitions for amber that I've seen before include "gemstone" , "Cautionary signal" , "Light giving warning" , "Cautionary light" , "Middle light" .)

I've seen this clue in The Independent.

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