Crossword Genius

Like a shoe, perhaps, that's unsafe to walk on (8)

Ross

I believe the answer is:

slippery

This clue is a double definition.

'like a shoe perhaps' is the first definition.
(like a slipper)

'unsafe to walk on' is the second definition.
(as in a slippery surface)

'that's' acts as a link.

(Other definitions for slippery that I've seen before include "Descent into sin in this sort of slope" , "Untrustworthy" , "Evasive, elusive" , "Not to be trusted" , "Wet, slimy; evasive" .)

I've seen this clue in The Times.
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