The most common and most likely answer to this crossword clue is the 4 plus 7 plus 1 plus 3 letter word SOLD SOMEONE A PUP
S
O
L
D
S
O
M
E
O
N
E
A
P
U
P
Buddy explains!
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.