The most common and most likely answer to this crossword clue is the 4 plus 2 letter word LOCK IN
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Buddy explains!
The straight part
We know that "Capture" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case capture = lock in.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 LOCK IN mean?
LOCK IN noun- A sleepover party, usually held in a public place such as a church or school, in which the participants are not allowed to leave until the next morning.
- An illegal but widely-tolerated invitation-only gathering in a British pub, after the end of licensing hours, to allow regular customers the opportunity to enjoy further drinking time.
- A situation in which members of an industry have agreed to adopt a certain standard and have retooled their production to meet this standard, thus making it very costly to change to a different standard.