Orderly to have a meal after end of session (4)
I believe the answer is:
neat
'orderly' is the definition.
('neat' can be a synonym of 'orderly')
'have a meal after end of session' is the wordplay.
'have a meal' becomes 'eat' (I've seen this before).
'after' says to put letters next to each other.
'end of' suggests the final letters.
The last letter of 'session' is 'n'.
'eat' put after 'n' is 'NEAT'.
'to' acts as a link.
(Other definitions for neat that I've seen before include "Cool - without a mixer" , "descendant of 19 [AUROCHS]" , "pat?" , "beef" , "Tidy - orderly" .)