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Prepares one salsa, but not all year (8)

Ross

I believe the answer is:

seasonal

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'prepares one salsa but not all year' is the definition.
I can't tell whether this defines the answer.

'prepares one salsa' is the wordplay.
'prepares' is an anagram indicator (I've seen 'prepared' mean this).
'one'+'salsa'='onesalsa'
'onesalsa' with letters rearranged gives 'SEASONAL'.

Can you help me to learn more?

(Other definitions for seasonal that I've seen before include "Varying according to time of year" , "depending on the month" , "For a particular period" , "not wanted all year" , "Occurring at particular times of the year" .)

I've seen this clue in The Mirror.
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