Caterpillar maybe avoiding hill, climbs barrow (4)
I believe the answer is:
cart
'barrow' is the definition.
(thesaurus)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for cart that I've seen before include "Carry with effort" , "Primitive transport" , "Old two-wheeled goods vehicle" , "Farm vehicle" , "Heavy open wagon" .)