Clue for semester, in the end (8)
I believe the answer is:
terminus
'the end' is the definition.
(terminus is a kind of end)
'clue for semester in' is the wordplay.
'clue' becomes 'us' (I can't justify this - if you can you should give a lot more credence to this answer).
'for' means one lot of letters go next to another (I've seen this in other clues).
'semester' becomes 'term' (I've seen this in another clue).
'term'+'in'='termin'
'us' put after 'termin' is 'TERMINUS'.
Can you help me to learn more?
(Other definitions for terminus that I've seen before include "End of the line, bus or train" , "journey's end" , "eg Paddington" , "End station" , "End, extremity" .)