Leaping around in underwear - bought here? (8,5)

I believe the answer is:

shopping malls

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'bought here?' is the definition.
The definition and answer are not the same part of speech.

'leaping around in underwear' is the wordplay.
'leaping around' becomes 'hopping' (hopping is a kind of leaping. I am not sure about the 'around' bit.).
'in' indicates putting letters inside.
'underwear' becomes 'smalls' (type of underwear).
'hopping' going within 'smalls' is 'SHOPPING MALLS'.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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