The most common and most likely answer to this crossword clue is the 10 letter word WEATHERMEN
W
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T
H
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M
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N
Buddy explains!
The straight part
We know that "employed by the Met department" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case employed by the met department = weathermen.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does WEATHERMEN mean?
WEATHERMEN noun- A person, especially a male one, who reports the weather conditions or forecasts.