Speed up the most intense parts (5)

I believe the answer is:

deeps

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'the most intense parts' is the definition.
The definition and answer can be both natural objects as well as being plural nouns.
Maybe you can see an association between them that I don't see?

'speed up' is the wordplay.
'up' says the letters should be written backwards (in down clue: letters go upwards).
'speed' back-to-front is 'DEEPS'.

Can you help me to learn more?

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

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