Westerner's hard heart (5)
I believe the answer is:
stern
'hard heart' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?
'westerner's' is the wordplay.
'STERN' is hidden in amongst the letters.
But, I am uncertain how this is indicated.
Can you help me to learn more?
(Other definitions for stern that I've seen before include "enforcing submission" , "Rents out at rear of boat" , "Unyielding - rump" , "Looking severe" , "Severe -- back of boat" .)