Crossword Genius

First of seasons each year is spring (3)

Ross

I believe the answer is:

spa

'is spring' is the definition.
(thesaurus)

'first of seasons each year' is the wordplay.
'first of' suggests taking the first letters.
'each year' becomes 'pa' ('p.a.' can be a synonym of 'each year').
The initial letter of 'seasons' is 's'.
's'+'pa'='SPA'

(Other definitions for spa that I've seen before include "Health resort near a spring" , "Watering hole" , "well" , "place of treatment" , "Health and beauty treatment establishment" .)

I've seen this clue in The Independent.
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