The most common and most likely answer to this crossword clue is the 6 letter word CLEVIS
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Buddy explains!
The straight part
We know that "into which tackle is pushed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case into which tackle is pushed = clevis.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 CLEVIS mean?
CLEVIS noun- A U-shaped coupling having holes at each end, through which a bolt is run; used especially to fit attachments to a tractor or other vehicle as it allows a degree of rotation about the bolt.