Peace-keepers giving in? That's straight (9)

I believe the answer is:

unbending

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'straight' is the definition.
(thesaurus)

'peace-keepers giving in?' is the wordplay.
'peace keepers' becomes 'un' (I've seen this in other clues).
'giving in?' becomes 'bending' (I am not sure about this - if you are sure you should believe this answer much more).
'un'+'bending'='UNBENDING'

'that's' is the link.

Can you help me to learn more?

(Another definition for unbending that I've seen is " Rigid".)

I've seen this clue in The Irish Times.

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