Spa got alternative power as temporary measure (4-3)
'temporary measure' is the definition.
(I've seen this before)
'spa got alternative power' is the wordplay.
'alternative' indicates anagramming the letters.
'power' becomes 'p'.
'spa'+'got'='spagot'
'spagot' is an anagram of 'stopga'.
'stopga'+'p'='STOPGAP'
'as' is the link.
(Other definitions for stopgap that I've seen before include "Temporary fix" , "Temporary measure" , "caretaker" , "Makeshift" , "A temporary substitute or solution" .)