8 down
Back
horse
with
tip
for
the
first
from
Haydock
(7)
Back horse with tip for the first from Haydock (7)
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The definition is at the beginning of the clue.
How the clue works
Back means to endorse or support. Take HORSE and substitute END (a "tip") for its first letter (H, indicated by "from Haydock"), giving END + ORSE = ENDORSE.