Stethoscope shows distinctive character (5)
I believe the answer is:
ethos
'distinctive character' is the definition.
(I've seen this before)
'stethoscope shows' is the wordplay.
'shows' says the answer is hidden in the clue.
'ETHOS' is hidden within 'stethoscope'.
(Other definitions for ethos that I've seen before include "Distinctive group spirit" , "Moral character" , "Distinctive attitudes of a people" , "Distinctive principles of an era, group, etc" , "moral code" .)