Final word in a line (8)

I believe the answer is:

terminal

'final' is the definition.
(I know that final can be written as terminal)

'word in a line' is the wordplay.
'word' becomes 'term' (term is a kind of word).
'line' becomes 'l' (used when specifying particular lines from a poem).
'term'+'in'+'a'+'l'='TERMINAL'

(Other definitions for terminal that I've seen before include "part of Heathrow?" , "storage facility" , "Electrical connector" , "Tramline (anag.)" , "End point of circuit" .)

I've seen this clue in The Telegraph.

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