Pulse bound to return to upper arm (7)
I believe the answer is:
humerus
'upper arm' is the definition.
The definition and answer can be both body parts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'pulse bound to return' is the wordplay.
'pulse' becomes 'hum' (I can't explain this - if you can you should believe this answer much more).
'bound to' becomes 'sure' (synonyms).
'return' says the letters should be written backwards.
'sure' in reverse letter order is 'erus'.
'hum'+'erus'='HUMERUS'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for humerus that I've seen before include "Boneo of the upper arm" , "Arm bone (that sounds comical)" , "Arm bone - the "funny bone"" , "What's often thought funny" , "Upper-arm bone" .)