21 across
Major
Shakespeare
role,
new,
to
memorise
(5)
Major Shakespeare role, new, to memorise (5)
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The definition is at the end of the clue.
How the clue works
Major Shakespeare role gives you LEAR — King Lear, of course — and then new tacks on N as its abbreviation. Put them together and you've got your answer, with to memorise as the definition.