21 across
Missile
landing
in
sniper’s
lair:
this
tightest
of
squeaks?
(9)
Missile landing in sniper’s lair: this tightest of squeaks? (9)
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The definition is at the end of the clue.
How the clue works
Look at this tightest of squeaks? — that's your definition, playing on the phrase "a narrow squeak." Then for the wordplay, sniper's lair gives you NEST, and missile gives you ARROW, which lands inside it to give you N-ARROW-EST.