Stupendously small tip (5)

I believe the answer is:

upend

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

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

'stupendously small' is the wordplay.
'UPEND' is hidden within the letters.
But, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for upend that I've seen before include "make stand" , "Invert" , "Affect greatly" , "Turn upside-down" , "Set upside down" .)

I've seen this clue in the Sydney Morning Herald.

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