21 across
Arctic
resident
worked
in
retirement
with
supercomputer
(7)
Arctic resident worked in retirement with supercomputer (7)
hints
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The definition is at the beginning of the clue.
How the clue works
Pointing at "Arctic resident" — that's your definition, the tusked whale from northern waters. For the wordplay, take RAN (meaning "worked"), and "in retirement" tells you to flip it round, giving NAR; stick on W (the usual abbreviation for "with"), then add HAL, the supercomputer from 2001, and you've built the whole thing up piece by piece.