Approve finishing point as alternative to London area (7)
I believe the answer is:
endorse
'approve' is the definition.
(endorse can mean to approve or support)
'finishing point as alternative to london area' is the wordplay.
'finishing' is a charade indicator (letters next to each other).
'point' becomes 'end' (end point is a kind of point).
'as alternative to' becomes 'or'.
'london area' becomes 'SE' (abbreviation for South East).
'end' next to 'or' is 'endor'.
'endor'+'se'='ENDORSE'
(Other definitions for endorse that I've seen before include "Give backing to" , "Put one's name to, approve" , "Put penalty points on (a driving licence)" , "Say you approve" , "No reeds (anag)" .)