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Activation
of
lever
in
bed
to
get
warmer
at
night?
(8)
Activation of lever in bed to get warmer at night? (8)
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The definition is at the end of the clue.
How the clue works
The definition is warmer at night?, a coverlet being a bed cover that keeps you warm. Take COT for "bed" and split it open, then insert an anagram (signalled by "Activation") of "lever" — the letters rearranged into VERLE — inside it, giving CO around VERLE plus T to make COVERLET.