Sentence:  The <WSD>clegs</WSD> continue to swarm all around. I wonder how many there are....Remaining seated on the block, I seize <WSD>clegs</WSD> out of the surrounding air at random, and with scissors cut out a tiny triangle from the rear edge of each one's right wing before releasing it. 
Meaning of the word marked with <WSD> tags:  A blood-sucking fly of the family (Tabanidae); a gadfly, a horsefly.