Hospital admitting American girl (5)
I believe the answer is:
susan
'girl' is the definition.
(I've seen this before)
'hospital admitting american' is the wordplay.
'hospital' becomes 'san' (I've seen this in other clues).
'admitting' means one lot of letters goes inside another.
'american' becomes 'us' (**).
'san' placed around 'us' is 'SUSAN'.
(Other definitions for susan that I've seen before include "sometimes lazy, passing round the condiments" , "woman" , "- - Sarandon (films)" , "She's a black-eyed flower" , "When lazy, she's a revolving tray on a dining table" .)