She is involved with Alec somewhere in London (7)
I believe the answer is:
chelsea
'in london' is the definition.
(I've seen this before)
'she is involved with alec' is the wordplay.
'is involved with' indicates anagramming the letters (involved can mean confusing or complex).
'she' mixed up with 'alec' makes 'CHELSEA'.
'somewhere' is the link.
I am not very happy about this link. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for chelsea that I've seen before include "The Blues of Stamford Bridge" , "issue for Clintons" , "Stamford Bridge team" , "place of buns" , "Where you might get buns" .)