Crossword clue: a large african antelope (alcelaphus tunata), similar to the hartbeest, but having its horns regularly curved.

The most common answer is sassaby (7 letters).

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

sassaby 7 letters web-def

a large South African antelope; considered the swiftest hoofed mammal

sassabye 8 letters web-def

A large African antelope (Alcelaphus tunata), similar to the hartbeest, but having its horns regularly curved.