23 down
Dog
muck
held
up
by
child
(5)
Dog muck held up by child (5)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
The definition is Dog. POO (muck) sits on top of CH (the abbreviation for child) — and that word "up" is your signal that one's stacked above the other, as this is a down clue.