2 down
One
who
flogs
deranged
15
with
tree
(8)
One who flogs deranged 15 with tree (8)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
Right, so one who flogs is your definition here — a retailer, someone flogging goods. Now that "15" isn't a number to sling into the wordplay directly, it's pointing you over to the answer at 15 across, which is LIAR. Stick that together with TREE and let "deranged" do its job as the anagram indicator, shuffling LIARTREE into RETAILER.