How the deft spider jets
The woven web-silk
From his spinnerets;
Line 9: “I lie in wait and watch”
Line 10: “How the deft spider jets”
Line 11: “The woven web-silk”
Line 12: “From his spinnerets;”
Summary of Stanza 3
“I lie in wait and watch”
(The speaker patiently observes.)
“How the deft spider jets”
(The spider skilfully sends out silk.)
“The woven web-silk”
(The silk becomes an intricate web.)
“From his spinnerets;”
(The silk comes from the spider’s spinnerets.)
Overall meaning: The speaker patiently watches the spider produce its web, turning observation into a scientific activity.