Vehicle is heap — pity me having to leave (7)

'vehicle' is the definition.
(ricksha is a kind of vehicle)

'heap pity me having to leave' is the wordplay.
I cannot quite understand how this works, but
'heap' could be 'rick' (rick is a kind of heap) and 'rick' is located in the answer.
The remaining letters 'sha' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'is' is the link.

Can you help me to learn more?