Area by lake left for everybody (3)
I believe the answer is:
all
'everybody' is the definition.
(I've seen this before)
'area by lake left' is the wordplay.
'area' becomes 'a' (maths abbreviation).
'by' is a charade indicator (letters next to each other).
'lake' becomes 'L' (geographical abbreviation).
'left' becomes 'L' (common abbreviation).
'a'+'l'+'l'='ALL'
'for' acts as a link.
(Other definitions for all that I've seen before include "that's as many as there are" , "Everyone - complete" , "Entirely; everyone" , "The lot, everyone" , "nothing more" .)