Are you sure collective noun for worms is clew?

The present day meaning of the noun 'clew' is a word for a metal  loop attached to the lower corner of a sail through which cords are  passed; the cords from which a hammock… is hung; a ball of thread or  yarn. Based on these definitions of the noun, it not difficult to  picture a group of worms that resemble a clump or ball of cord or  yarn.    The present day 'clue' was originally spelled 'clew', and based on  the same meanings of the word, it isn't difficult to imagine  untangling (following) a cord to secure a sail or hang a hammock. (MORE)