Compo absorbing a shock endlessly in beguilement (10)

I believe the answer is:

cajolement

I'm a little stuck... Click here to teach me more about this clue!

'compo' is the definition.
Both the definition and answer are singular nouns.
Maybe there's a link between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.