The most common and most likely answer to this crossword clue is the 6 letter word CAPTOR
C
A
P
T
O
R
More clues leading to the result CAPTOR
- Better prominence for jailer?
- Guard's request to turn in vehicle
- Vehicle carrying new top for keeper
- One seizes highest point
- Keeper fell, following selection for national team
- Someone holding another’s hat above the peak
- He catches someone using top gear on hill
- Jailor’s headgear has peak
- Cover, on a hill, one who's taken a prisoner
- Jailer’s hat, mostly torn
Buddy explains!

The straight part
We know that "One seizes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one seizes = captor.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 CAPTOR mean?
CAPTOR noun- One who is holding a captive or captives.
- One who catches or has caught or captured something or someone.