The most common and most likely answer to this crossword clue is the 6 plus 2 plus 9 letter word MASTER OF FOXHOUNDS
M
A
S
T
E
R
O
F
F
O
X
H
O
U
N
D
S
Buddy explains!
The straight part
We know that "Who will give instructions to pack up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case who will give instructions to pack up = master of foxhounds.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.