Head driller and surrogate parent (6)
I believe the answer is:
trepan
'head driller' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'surrogate parent' is the wordplay.
'parent' anagrams to 'TREPAN'.
Though, I am unsure how the anagram is indicated.
'and' is the link.
Can you help me to learn more?
(Other definitions for trepan that I've seen before include "Make perforation in person's skull" , "Surgical instrument used to remove sections of bone from the skull" , "Surgically create a hole in the skull" , "Perforate skull (med.)" , "Make a hole in skull" .)