The most common and most likely answer to this crossword clue is the 3 letter word FED
F
E
D
More clues leading to the result FED
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 FED mean?
FED noun- A federal government officer or official, especially FBI, CIA, NSA, ATF, and DEA agents.
- A police officer.
- A “federation” in which powerlifters organize to compete.
- (ditransitive) To give (someone or something) food to eat.
- To eat (usually of animals).
- To give (someone or something) to (someone or something else) as food.
- To give to a machine to be processed.
- To satisfy, gratify, or minister to (a sense, taste, desire, etc.).
- To supply with something.
- To graze; to cause to be cropped by feeding, as herbage by cattle.
- To pass to.
- (of a phonological rule) To create the environment where another phonological rule can apply; to be applied before another rule.
- (of a syntactic rule) To create the syntactic environment in which another syntactic rule is applied; to be applied before another syntactic rule.