Crossword Genius

Around pole, tent pitched in sand on vacation became less level (9)

Ross

I believe the answer is:

steepened

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

'became less level' is the definition.
The definition and answer can be both related to change as well as being past participle verbs.
Maybe they are linked in a way I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for steepened that I've seen is " Became more inclined".)

I've seen this clue in The Independent.
Want a hint initially instead of a full solution? Install my app