Doctor coming up with hospital gets some resistance (3)
I believe the answer is:
ohm
'some resistance' is the definition.
(I've seen this before)
'doctor coming up with hospital' is the wordplay.
'doctor' becomes 'mo' (medical officer**).
'coming up' says the letters should be written backwards.
'with' indicates putting letters inside.
'hospital' becomes 'h'.
'mo' reversed gives 'om'.
'om' enclosing 'h' is 'OHM'.
'gets' acts as a link.
(Other definitions for ohm that I've seen before include "SI unit of electrical resistance" , "measure of resistance" , "A little resistance" , "Physicist" , "physical unit" .)