Heartbroken, is not without friends (5)
I believe the answer is:
earth
'heartbroken' is the definition.
(heart anagrammed 'broken' can make earth)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for earth that I've seen before include "See 12" , "Soil; electrical ground" , "The 3rd planet from the sun" , "wire" , "Soil; ground terminal" .)