Crossword Genius

Examine small tin (4)

Ross

I believe the answer is:

'examine' is the definition.
(scanning is a kind of examining)

'small tin' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'tin' becomes 'can' (synonyms).
's'+'can'='SCAN'

(Other definitions for scan that I've seen before include "MRI or CAT say", "Perusal", "Survey - fit in metrically", "Survey, maybe by X-ray", "Analyse rhythm of line of verse".)

I've seen this clue in The Telegraph.