Crossword puzzle clue "the newlywed siamese fighting fish fed each other"

The newlywed Siamese fighting fish fed each other ___

Besties who also literally hate each other's guts but we're besties but we hate each other so much it hurts sometimes

Siamese fighting fish

Like each answer in this puzzle - also each word in each clue - in length

At each other's -- (fighting)

Kind of commercial pact where two countries agree to treat each other as well as any other

The other other other woman

Where to order un thé