Surgeon accepted American kiss (4)
I believe the answer is:
buss
'kiss' is the definition.
('buss' can be a synonym of 'kiss')
'surgeon accepted american' is the wordplay.
'surgeon' becomes 'bs'.
'accepted' means one lot of letters goes inside another.
'american' becomes 'us' (**).
'bs' enclosing 'us' is 'BUSS'.
(Other definitions for buss that I've seen before include "maiden lady immune to Cupid's darts" , "Conductor" , "Kiss" , "This fishing vessel" , "smack" .)