Find travel stop up in Seattle tomorrow (5)
I believe the answer is:
motel
'find travel stop' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'up in seattle tomorrow' is the wordplay.
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'in' indicates the answer is hidden within the clue.
'letom' is hidden in the letters of 'seattle tomorrow'.
'letom' written backwards gives 'MOTEL'.
(Other definitions for motel that I've seen before include "Lodgings for car travellers in the US" , "Hotel designed for the motorist" , "Commercial accommodation" , "Place for drivers to stay" , "Roadside establishment" .)