Laundry detergent brand (4)
'laundry detergent brand' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tide that I've seen before include "Periodic water movement" , "Powerful surge" , "Movement of seawater" , "Periodic rise and fall of the sea" , "Current, ebb" .)
(Other definitions for era that I've seen before include "Significant time" , "Age marked by a distinctive character" , "Important date" , "US equality law" , "Long stretch" .)