10 across
Rubbing
it
in,
first
of
ointment
absorbed
by
tongue
in
horse
(8)
Rubbing it in, first of ointment absorbed by tongue in horse (8)
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The definition is at the beginning of the clue.
How the clue works
Look at Rubbing it in — that's your definition, meaning gloating over someone's misfortune. For the wordplay, take the first letter of "ointment", which is O, and have it absorbed by LATIN (the tongue), giving LOATIN. Then pop all that inside GG (a horse), so you get G, then LOATIN, then G.