How many letters does the top answer for “deep-sea fish with a large head and body and long tapering tail” have?

The most common answer is grenadier (9 letters).

Crossword clue: deep-sea fish with a large head and body and long tapering tail

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

grenadier 9 letters wn-def

deep-sea fish with a large head and body and long tapering tail

rattail 7 letters wn-def

deep-sea fish with a large head and body and long tapering tail