Everyman eating starter of udon, followed by rieslings: essentially healthy meal (6)
I believe the answer is:
muesli
'healthy meal' is the definition.
'everyman eating starter of udon followed by rieslings essentially' is the wordplay.
'everyman' becomes 'me' (where 'Everyman' is the setter of the crossword).
'eating' indicates putting letters inside.
'starter of' says to take the initial letters.
'followed by' is a charade indicator (letters next to each other).
'essentially' means to look at the middle letters.
The middle letters of 'rieslings' are 'sli'.
The initial letter of 'udon' is 'u'.
'me' placed around 'u' is 'mue'.
'mue'+'sli'='MUESLI'
(Other definitions for muesli that I've seen before include "eaten at breakfast" , "Breakfast mix of oats, nuts, fruit etc" , "Breakfast mixture of dry cereals and fruits" , "Rolled oats, nuts and fruit mixture" , "Breakfast food of cereal, nuts, dried fruit etc with milk" .)