Seasons (5)
'seasons' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tides that I've seen before include "drifts" , "Periodic changes in sea levels" , "Lunar-driven ocean movements" , "Diets (anag.)" , "Lunar-driven movements of oceans" .)
(Other definitions for salts that I've seen before include "medication" , "Medicinal compounds; Epsom --" , "Epsom--; smelling --" , "Six [EPSOM]'s might revive" , "Old sailors" .)