Most economical spring break (7)

I believe the answer is:

sparest

'most economical' is the definition.
(spare can mean economical or frugal)

'spring break' is the wordplay.
'spring' becomes 'spa' (spa can mean a mineral spring).
'break' becomes 'rest' (a rest is taking a break).
'spa'+'rest'='SPAREST'

I've seen this clue in The Guardian.

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