The most common and most likely answer to this crossword clue is the 3 plus 7 letter word DOG COLLARS
I've seen this crossword clue in The Sunday Telegraph
D
O
G
C
O
L
L
A
R
S
More clues leading to the result DOG COLLARS
Buddy explains!
The straight part
We know that "White straps" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case white straps = dog collars.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.