Blue berets rushed round back of farm, suffering no hurt (8)

I believe the answer is:

unharmed

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'back of farm suffering no hurt' is the definition.
Both the definition and answer are adjectives. Maybe there's an association between them I don't understand?

'blue berets rushed' is the wordplay.
'blue berets' becomes 'UN' (United Nations peacekeepers).
'rushed' becomes 'harmed' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'un'+'harmed'='UNHARMED'

'round' acts as a link.

Can you help me to learn more?

(Other definitions for unharmed that I've seen before include "not wounded" , "Not injured or damaged" .)

I've seen this clue in The Times.

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