Add salt to spring, perhaps? (6)
I believe the answer is:
season
This clue is a double definition.
'add salt' is the first definition.
(I've seen this before)
'to spring perhaps?' is the second definition.
(spring is a season)
(Other definitions for season that I've seen before include "One of four periods" , "Time of 9" , "Add condiments to for time of year" , "Salt, maybe" , "Add flavour at a certain time of year" .)