Crossword Genius

I walk on ice, turning you mad (3,4,7)


I believe the answer is:

off ones trolley

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

'mad' is the definition.
(I've seen this before)

'i walk on ice turning you' is the wordplay.
I cannot really see how this works, but
'i' could be 'one' (Roman numeral for one) and 'one' is present in the answer.
'walk' could be 'stroll' (strolling is a kind of walking) and 'stroll' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for off ones trolley that I've seen before include "Mad" , "From which one may be served sweet" , "out to lunch" , "finally found hospital bed?" , "nuts" .)

I've seen this clue in The Times.
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