Relative’s place regularly visited, in part of London (4)
I believe the answer is:
aunt
'relative's' is the definition.
(aunt is a type of relative)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for aunt that I've seen before include "Wife of one's uncle" , "Parent's female sibling" , "Parent's sister" , "Female relation" , "Tuna (anag.)" .)