Final alternative tram line (8)
I believe the answer is:
terminal
'final' is the definition.
(I know that final can be written as terminal)
'alternative tram line' is the wordplay.
'alternative' indicates anagramming the letters (an alternative ordering of the letters).
'tram'+'line'='tramline'
'tramline' with letters rearranged gives 'TERMINAL'.
(Other definitions for terminal that I've seen before include "storage facility" , "Final; connection point" , "Electrical connector" , "At the end; connection" , "Fatal - tram line (anag)" .)