The most common and most likely answer to this crossword clue is the 6 letter word FEEDER
I've seen this crossword clue in The Daily Telegraph
F
E
E
D
E
R
More clues leading to the result FEEDER
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 FEEDER mean?
FEEDER noun- One who feeds, or gives food to another.
- One who feeds, or takes in food.
- One who, or that which, feeds material into something.
- That which is used to feed.
- A tributary stream, especially of a canal.
- A branch line of a railway.
- A transmission line that feeds the electricity for an electricity substation, or for a transmitter.
- A feeder school.
- A feeder ship.
- A judge whose law clerks are often selected to become clerks for the Supreme Court.
- (1800s) The pitcher.
- A player whose character is killed by the opposing player or team more than once, deliberately or through lack of skills and experience, thus helping the opposing side.
- One who abets another.
- A parasite.