The most common and most likely answer to this crossword clue is the 6 letter word HOGGED
I've seen this crossword clue in Financial Times
H
O
G
G
E
D
Buddy explains!

The straight part
We know that "cornered" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cornered = hogged.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 HOGGED mean?
HOGGED verb- To greedily take more than one's share, to take precedence at the expense of another or others.
- To clip the mane of a horse, making it short and bristly.
- To scrub with a hog, or scrubbing broom.
- To cause the keel of a ship to arch upwards (the opposite of sag).
- To process (bark, etc.) into hog fuel.
- Broken or strained so as to have an upward curve between the ends.