"For" signals that what follows is an explanation or elaboration of what has been said previously. The subject is "the same uprush of fancy". Picking out some earlier words, we could create a sentence like this: "He had not been so happy for months, for the same uprush of fancy ...
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meowthI'm still very confusedDo you understand "He had not been so happy for months, for the same uprush of fancy ... etc."?
meowtha.)if it's a conjunction, where is the primary clause?Good question. The author has taken the liberty of not having a main clause at all for stylistic reasons. For is a subordinate conjunction and means because.