Change ends in bar, therefore (4)
I believe the answer is:
thus
'therefore' is the definition.
(synonyms)
'change ends in bar' is the wordplay.
I cannot quite understand how this works, but
'bar' could be 't' (T-bar is a part of a ski lift) and 't' is located in the answer.
The remaining letters 'hus' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for thus that I've seen before include "Like so" , "It follows" , "an original Christmas gift" , "Shut (anag.)" , "Therefore, hence" .)