Put an end to Highlander maybe and companion (6)
I believe the answer is:
scotch
'put an end' is the definition.
(I've seen this before)
'highlander maybe and companion' is the wordplay.
I cannot really understand how this works, but
'highlander' could be 'scot' (I've seen this in another clue) and 'scot' is found within the answer.
'companion' could be 'ch' (Companion of Honour) and 'ch' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'to' acts as a link.
Can you help me to learn more?
(Other definitions for scotch that I've seen before include "Put an end to the whiskey" , "hard drink" , "Put an end to - as Jock might?" , "providing nursery facility in school" , "Northern whisky" .)