Spring is ending obviously, and summer starts (5)
I believe the answer is:
oasis
'spring' is the definition.
(I've seen this before)
'is ending obviously and summer starts' is the wordplay.
'ending' says to put letters next to each other.
'starts' says to take the initial letters.
The initial letters of 'obviously and summer' is 'oas'.
'is' put after 'oas' is 'OASIS'.
(Other definitions for oasis that I've seen before include "Place of rest in the midst of gloom" , "A place of safety or sanctuary" , "retreat" , "Band with Liam and Noel Gallagher" , "place to escape gloom?" .)