Crossword Genius

Male casualty in US I look after (9)

Ross

I believe the answer is:

chaperone

'look after' is the definition.
(I've seen this before)

'male casualty in us i' is the wordplay.
'male' becomes 'chap' (chap is a kind of male).
'casualty in us' becomes 'ER' (emergency room, US equivalent to casualty dept.).
'i' becomes 'one' (Roman numeral for one).
'chap'+'er'+'one'='CHAPERONE'

(Other definitions for chaperone that I've seen before include "Young lady's protector" , "attendant" , "One overseeing" , "Companion" , "Guardian" .)

I've seen this clue in The Times.
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