It's like a mountain in the Apennines (4)
I believe the answer is:
heap
'it's like a mountain' is the definition.
I can't tell whether this definition defines the answer.
'in the apennines' is the wordplay.
'in' says the answer is hidden in the clue.
'HEAP' is hidden within 'the apennines'.
Can you help me to learn more?
(Other definitions for heap that I've seen before include "Mound - dilapidated vehicle" , "car on its last legs" , "Mound, stack" , "Rough pile" , "Wreck of a car" .)