Friday and every Saturday initially revealing side? (5)
I believe the answer is:
fries
'side?' is the definition.
(I know that fries is a type of side)
'friday and every saturday initially' is the wordplay.
'friday' becomes 'Fri' (synonyms).
'and' is a charade indicator (letters next to each other).
'initially' indicates taking the first letters.
The initial letters of 'every saturday' is 'es'.
'fri'+'es'='FRIES'
'revealing' acts as a link.
(Other definitions for fries that I've seen before include "food for grazing?" , "Cooks; chips (Amer.)" , "Cooks in fat" .)