Exorbitant, and hard to get over? (5)
I believe the answer is:
steep
'exorbitant' is the definition.
(synonyms)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for steep that I've seen before include "Without the bounds of moderation" , "Vertiginous; excessive" , "Marinate" , "Almost perpendicular" , "Soak; expensive (price)" .)