The most common and most likely answer to this crossword clue is the 7 letter word TARPONS
I've seen this crossword clue in Financial Times
T
A
R
P
O
N
S
Buddy explains!

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 TARPONS mean?
TARPONS noun- Any of several fishes of the family Elopidae or Megalopidae, especially a large silvery game fish.