... he applies pressure, breaking Norrie (6)

I believe the answer is:

ironer

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'he applies pressure' is the definition.
The definition suggests a singular noun but the answer is not.

'breaking norrie' is the wordplay.
'breaking' is an anagram indicator.
'norrie' anagrammed gives 'IRONER'.

Can you help me to learn more?

(Other definitions for ironer that I've seen before include "An evening worker" , "I smooth" , "could be one finishing off the washing?" , "Clothes presser like Renoir" , "One pressing clothes" .)

I've seen this clue in The Independent.

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