Place for a constitutional Liberal and a sleep? (9)

I believe the answer is:

esplanade

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'place for a constitutional' is the definition.
I can't judge whether this defines the answer.

'liberal and a sleep?' is the wordplay.
'liberal' indicates anagramming the letters.
'and'+'a'+'sleep'='andasleep'
'andasleep' is an anagram of 'ESPLANADE'.

Can you help me to learn more?

(Other definitions for esplanade that I've seen before include "front" , "walk by sea" , "Paved area at seaside resort" , "Seafront walkway" , "prom" .)

I've seen this clue in The Independent.

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