Sentence:  Now here it was 12.20 and he had another 15,000 envelopes to <WSD>feddle</WSD> before he knocked off. If he <WSD>feddled</WSD> well, conscientiously, Gremm would apply a heavy, gluey mixture to the flap of each envelope, then allow it to dry. 
Meaning of the word marked with <WSD> tags:  To fuss over.