The most common and most likely answer to this crossword clue is the 8 letter word STRAPPER
I've seen this crossword clue in The Daily Telegraph
S
T
R
A
P
P
E
R
More clues leading to the result STRAPPER
Buddy explains!
The straight part
We know that "big person" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case big person = strapper.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 STRAPPER mean?
STRAPPER noun- A large, strong, robust person (usually a man).
- A person who works with straps, as on leather goods.
- One who straps horses.
- A cow which yields a small amount of milk.
- A wire that joins two light switches so that a light can be turned off or on from either switch.