Doctors are ultimately reluctant to get in remedy for brute (8)
I believe the answer is:
creature
'brute' is the definition.
('creature' can be a synonym of 'brute')
'doctors are ultimately reluctant to get in remedy' is the wordplay.
'doctors' is an anagram indicator.
'ultimately' indicates one should take the final letters.
'to get in' means one lot of letters goes inside another.
'remedy' becomes 'cure' ('cure' can be a synonym of 'remedy').
The last letter of 'reluctant' is 't'.
'are'+'t'='aret'
'aret' with letters rearranged gives 'reat'.
'reat' inserted inside 'cure' is 'CREATURE'.
'for' is the link.
(Other definitions for creature that I've seen before include "These comforts make life easy" , "Brute" , "Human being or lower animal" , "Animal as distinct from human being" , "Any organism with voluntary movement" .)