After a meal seem not half relaxed (2,4)
I believe the answer is:
at ease
'relaxed' is the definition.
('at ease' can be similar in meaning to 'relaxed')
'after a meal seem not half' is the wordplay.
'after' is a charade indicator (letters next to each other).
'meal' becomes 'tea' (tea is a kind of meal).
'not half' suggests halving the letters.
'seem' cut in half is 'se'.
'a' next to 'tea' is 'atea'.
'atea'+'se'='AT EASE'
(Other definitions for at ease that I've seen before include "resting" , "Military order to relax from attention" , "Army command to relax, stand with feet apart" , "In a relaxed attitude" , "Relaxed, not tense - that's an order" .)