The most common and most likely answer to this crossword clue is the 6 letter word RIVETS
I've seen this crossword clue in The Daily Telegraph
R
I
V
E
T
S
More clues leading to the result RIVETS
Buddy explains!
The straight part
We know that "bolts" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bolts = rivets.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 RIVETS mean?
RIVETS noun- A cylindrical mechanical fastener that attaches multiple parts together by fitting through a hole and deforming the head(s) at either end.
- Any fixed point or certain basis.
- A light kind of footman's armour.
- To attach or fasten parts by using rivets.
- To install rivets.
- To command the attention of.
- To make firm or immovable.