Mum reversing car always in Venezuelan city (7)

'venezuelan city' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'mum reversing car always' is the wordplay.
I cannot quite see how this works, but
'mum' could be 'ma' (both can mean mother) and 'ma' is present in the answer.
an anagram of 'car' is 'rac' which is present in the answer.
'always' could be 'ay' (archaic term for 'always') and 'ay' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

'in' acts as a link.

Can you help me to learn more?