Examination Charlie received in hospital (4)
I believe the answer is:
scan
'examination' is the definition.
(I know that scan is a type of examination)
'charlie received in hospital' is the wordplay.
'charlie' becomes 'C' (phonetic alphabet: alpha, bravo, charlie etc.).
'received in' indicates putting letters inside.
'hospital' becomes 'san' (short for sanatorium).
'c' inserted within 'san' is 'SCAN'.
(Other definitions for scan that I've seen before include "Examine, view" , "short survey" , "Peruse, scrutinise" , "Look over cursorily" , "View quickly" .)