Crossword puzzle clue "ruler with custard desserts"

FLANK, to be situated to the side of

ECLAIR, a cake with cream filling and usually chocolate icing

FLAN, a type of custard, also FLAMM, FLAUNE, FLAWN

any of the various trees and shrubs of the genus Annona grown for their edible fruits

a small, thin, crisp cake

BISCUIT, a small, thin, crisp cake