Son out of bed for every meal (6)
I believe the answer is:
supper
'meal' is the definition.
(I know that supper is a type of meal)
'son out of bed for every' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'out of bed' becomes 'up' (synonyms).
'for every' becomes 'per' ('per' means 'for each' or 'for every').
's'+'up'+'per'='SUPPER'
(Other definitions for supper that I've seen before include "has one had a few drinks?" , "Eats late" , "Early evening meal" , "Light, late, meal" , "singing for this?" .)