Crossword Genius

Vitamin can change role on the outside (7)

Ross

I believe the answer is:

retinol

'vitamin' is the definition.
(I know that retinol is a type of A)

'can change role on the outside' is the wordplay.
'can' becomes 'tin' (both are metal containers).
'change' indicates an anagram.
'on the outside' means one lot of letters goes inside another.
'role' anagrammed gives 'reol'.
'tin' going inside 'reol' is 'RETINOL'.

(Other definitions for retinol that I've seen before include "certain vitamin" , "vitamin essential for good eyesight" .)

I've seen this clue in The Daily Express.
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