Progress smoothly when getting into bed (5)
I believe the answer is:
coast
'progress smoothly' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'when getting into bed' is the wordplay.
'when' becomes 'as' (eg 'when I walked' means 'as I walked').
'getting into' means one lot of letters goes inside another.
'bed' becomes 'cot' (cot is a kind of bed).
'as' put into 'cot' is 'COAST'.
Can you help me to learn more?
(Other definitions for coast that I've seen before include "Littoral region" , "See 9" , "Seaside - freewheel" , "Land beside the sea" , "Cruise" .)