Small valley located in my German city (8)

I believe the answer is:

medellin

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

'city' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'small valley located in my german' is the wordplay.
'small valley' becomes 'dell' (I've seen this in another clue).
'located in' indicates putting letters inside.
'my german' becomes 'mein' ('my' in German).
'dell' inserted into 'mein' is 'MEDELLIN'.

Can you help me to learn more?

I've seen this clue in The Independent.

Want a hint initially instead of a full solution? Install my app