Crossword Genius

It's a slippery slope (5)

Ross

I think it could be either:

slide

piste

I'm a little stuck... Click here to teach me more about this clue!

'a slippery slope' is the definition.
(I've seen this before)

'it's' is the wordplay.
I cannot really see how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found in the answer.
The remaining letters 'pise' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for piste that I've seen before include "A ski run of compacted snow" , "Ski-slope" , "Ski slope" , "Ski trail" , "slippery slope" .)

I've seen this clue in The New York Times.
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