15 across
Poet’s
one
line
in
masculine
style
(6)
Poet’s one line in masculine style (6)
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The definition is at the beginning of the clue.
How the clue works
The definition is Poet — your man John Milton. For the wordplay, masculine gives you M, then one chips in I, line gives you L, and style (think fashion, as in "ton") rounds it off with TON — stack them all up and you've got your answer.