Remains for doctors to take in for example (5)
I believe the answer is:
dregs
'remains' is the definition.
(I've seen this in another clue)
'doctors to take in for example' is the wordplay.
'doctors' becomes 'Drs' ('Dr' can be a synonym of 'doctor').
'to take in' means one lot of letters goes inside another.
'for example' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'drs' enclosing 'eg' is 'DREGS'.
'for' is the link.
(Other definitions for dregs that I've seen before include "Lees - riffraff" , "Remnant of drink" , "Remaining sediment" , "Grounds; refuse" , "Residue of drink" .)