Spain - but not in spring (3)
I believe the answer is:
spa
'spring' is the definition.
(spa can mean a mineral spring)
'spain but not in' is the wordplay.
'but not' is a deletion indicator.
'spain' with 'in' taken away is 'SPA'.
(Other definitions for spa that I've seen before include "here for the good of his health?" , "town in Belgium" , "Health resort at a mineral spring" , "Resort with mineral water spring" , "Water source" .)