The most common and most likely answer to this crossword clue is the 7 letter word RELINED
R
E
L
I
N
E
D
Buddy explains!
The straight part
We know that "Attached new canvas" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case attached new canvas = relined.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 RELINED mean?
RELINED verb- To add new lines to.
- To add a new lining to.