Pro in prime hurt: it's shocking (8)

I believe the answer is:

improper

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'shocking' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

'pro in prime hurt' is the wordplay.
'in' is an insertion indicator.
'hurt' indicates anagramming the letters.
'prime' with letters rearranged gives 'imper'.
'pro' inserted into 'imper' is 'IMPROPER'.

'it's' is the link.

Can you help me to learn more?

(Other definitions for improper that I've seen before include "Not decorous or seemly" , "Unfitting, out of place" , "So it may appear a fraction" , "Not fitting" , "unacceptable?" .)

I've seen this clue in The Sun.

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