Crossword Genius

Like something off the sweet trolley - or off one's own? (5,2,1,9)

Ross

I believe the answer is:

nutty as a fruitcake

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'like something' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'the sweet trolley or off one's own?' is the wordplay.
I cannot quite see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
'sweet' could be 'fruitcake' (I've seen this before) and 'fruitcake' is located in the answer.
'one's' could be 'as' (a thing is one thing) and 'as' is present in the answer.
This explanation may well be incorrect...

'off' is the link.

Can you help me to learn more?

I've seen this clue in The Times.
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