Crossword puzzle clue "a crab makes a sour one"

a familiar name for a cat

a pale yellow oval citrus fruit with sour-tasting flesh

ACERBATE, to embitter, to irritate

EMBITTER, to make bitter, also IMBITTER

a member of the crustacea, a large class of arthropod animals with hard shells

(Latin) a hazy or indistinct luminous area in the night sky representing a distant cluster of stars

one of the two pivoted parts of a grasping tool