Mean to wreck veg area (7)
I believe the answer is:
average
'mean' is the definition.
(I know that mean can be written as average)
'wreck veg area' is the wordplay.
'wreck' indicates an anagram.
'veg'+'area'='vegarea'
'vegarea' anagrammed gives 'AVERAGE'.
'to' acts as a link.
(Other definitions for average that I've seen before include "Mean - norm" , "Moderate" , "building society customer loses capital over time" , "Usual - mediocre - mean" , "Mean - everyday" .)