18 down
Trick
old
horse
to
get
into
line
(7)
Trick old horse to get into line (7)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
See Trick sitting there as the definition — finagle means exactly that, to wangle something by a bit of deceit. For the wordplay, take NAG (a rather worn-out old horse) and tuck it inside FILE (a line of people or things), and you get FI-NAG-LE slotting together nicely.