Sentence:  Philander went into the next room, which was <WSD>just</WSD> a lean-to hitched on to the end of the shanty, and came back with a salt mackerel that dripped brine like a rainstorm. Then he put the coffee pot on the stove and rummaged out a loaf of dry bread and some hardtack. 
Meaning of the word marked with <WSD> tags:  Only, simply, merely.