What does the cryptic crossword clue "Engineer most eager to find large metal tank (9)" mean?

The definition is "tank". The wordplay uses an anagram. anagram of MOST + EAGER = GASOMETER; definition: "tank" The answer is GASOMETER.

Engineer most eager to find large metal tank (9)

Daily Mail Cryptic #17358 | 7 Down | 2024-05-15 flower