The most common and most likely answer to this crossword clue is the 7 letter word FROGMAN
I've seen this crossword clue in The Times
F
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More clues leading to the result FROGMAN
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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 FROGMAN mean?
FROGMAN noun- A diver, especially one in a diving suit (as opposed to one in scuba gear).
- A military diver, e.g. a US Navy SEAL.