Spring appears, finally, every year (3)
I believe the answer is:
spa
'spring' is the definition.
(thesaurus)
'appears finally every year' is the wordplay.
'finally' suggests the final letters.
'every year' becomes 'pa' (per annum).
The last letter of 'appears' is 's'.
's'+'pa'='SPA'
(Other definitions for spa that I've seen before include "Where people go for spring" , "Cheltenham or Bath?" , "Bath, possibly" , "eg Bath" , "Healthy place" .)