The most common and most likely answer to this crossword clue is the 5 letter word BURLY
I've seen this crossword clue in The Times
B
U
R
L
Y
More clues leading to the result BURLY
Buddy explains!
The straight part
We know that "Strapping" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case strapping = burly.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 BURLY mean?
BURLY adjective- (usually of a man) Large, well-built, and muscular.
- (East End of London) Great, amazing, unbelievable.
- (surf culture and/or Southern California) Of large magnitude, either good or bad, and sometimes both.
- Full of burls or knots; knotty.