Crossword puzzle clue "like a tough to see line"

Like a tough-to-see line

"See how they smile, like pigs in a sty, see how they ___" (line from "I Am the Walrus")

Like a computer that could put Reagan into office, I see. You see?

They're tough to see through

"Now we'll see how tough you are!"

Add vertical line 13 (word 3) and vertical line 3 (word 1) together and enter the answer to the resulting clue on this line

Add vertical line 9 (word 2) and vertical line 7 (word 2) and enter the answer to the resulting clue on this line

Add vertical line 1 (word 1) and vertical line 15 (word 3) and enter the answer to the resulting clue on this line