7 down
Santa
likely,
initially,
to
move
cautiously
on
it?
(6)
Santa likely, initially, to move cautiously on it? (6)
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The definition is at the end of the clue.
How the clue works
The definition is to move cautiously on it? — with the cheeky implication that Santa's the one doing it. Take the initial letters of Santa likely to get SL, then add edge (to move cautiously, as in edging along), and you've got your answer.