Season (6)
'season' is the definition.
(both can mean a period)
This is all the clue.
(Other definitions for time that I've seen before include "Hours clocked up?" , "Era" , "Rhythm" , "Procrastination is the thief of ." , "'Every ... we say goodbye, I cry a little' /Cole Porter" .)
(Other definitions for tide that I've seen before include "Powerful surge" , "Regular movement" , "Movement of seawater" , "Periodic flow" , "Rising and falling of the sea" .)
(Other definitions for open that I've seen before include "Golf tournament" , "Widely known" , "Affording access" , "Undo; ready for business" , "Ready for business; spread out; manifest" .)
'season' is the definition.
(winter is a season)
This is the entire clue.
(Other definitions for winter that I've seen before include "Cold season" , "Cold period" , "period of discontent?" , "'If . . . . . . comes, can spring be far behind?'" , "period of freeze?" .)
'season' is the definition.
(summer is a season)
This is all the clue.
(Other definitions for summer that I've seen before include "Warmest season" , "Best of times" , "- - time (Gershwin)" , "Late singer" , "Adder" .)
'season' is the definition.
(spring is a season)
This is all the clue.
(Other definitions for spring that I've seen before include "Wellhead or bounce" , "Bound < to start" , "split" , "Season of growth" , "Jump up in early season" .)
'season' is the definition.
(autumn is a season)
This is all the clue.
(Other definitions for autumn that I've seen before include "Season, has its music too (Keats)" , "When harvests ripen" , "Fall in the US" , "Fall in North America" , "'O wild West Wind, thou breath of . . . . . . 's being' (Shelley)" .)