Pops round the corner making certain sounds (5)

I believe the answer is:

plops

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'certain sounds' is the definition.
'plops' can be an answer for 'sounds' (plop is a kind of sound). I'm not sure about the 'certain' bit.

'pops round the corner' is the wordplay.
'round' means one lot of letters goes inside another.
'the corner' becomes 'l' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'pops' placed around 'l' is 'PLOPS'.

'making' acts as a link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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