Sorted out internal energy and unit of magnetic field strength (7)
I believe the answer is:
oersted
'unit of magnetic field strength' is the definition.
(I've seen this before)
'sorted out internal energy' is the wordplay.
I cannot really see how this works, but
'energy' could be 'e' (physics symbol as in E=mc2) and 'e' is found within the answer.
an anagram of 'sorted' is 'orsted' which is within the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...
'and' acts as a link.
Can you help me to learn more?
(Other definitions for oersted that I've seen before include "Physics unit of magnetic field strength" , "Ted Rose (anag) - Danish physicist who discovered electromagnetism" , "Physical unit" .)