Doctor in hospital shunted around many small parts (10)

'many small parts' is the definition.
The definition and answer can be both relationships as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

'doctor in hospital shunted' is the wordplay.
I cannot quite see how this works, but
'doctor' could be 'dr' (abbreviation) and 'dr' is found in the answer.
'hospital' could be 'h' (abbreviation for hospital) and 'h' is present in the answer.
an anagram of 'shunted' is 'unedths' which is located in the remaining letters.
No letters remain.
This explanation may well be incorrect...

'around' acts as a link.

Can you help me to learn more?