Relax, flying a kite followed by drinks at day's end (4,2,4)
I believe the answer is:
take it easy
'relax' is the definition.
(I know that take it easy is a more specific form of the action relax)
'flying a kite followed by drinks at day's end' is the wordplay.
'flying' indicates anagramming the letters (letters fly around into new positions).
'followed by' means one lot of letters go next to another.
'drinks' becomes 'teas' (tea is a kind of drink).
'at' is a charade indicator (letters next to each other).
'end' suggests the final letters.
The final letter of 'day' is 'y'.
'a'+'kite'='akite'
'akite' with letters rearranged gives 'takei'.
'takei'+'teas'+'y'='TAKE IT EASY'
(Other definitions for take it easy that I've seen before include "to rest" , "Lighten up" , "Avoid stress - remain calm" , "Relax" , "avoid exertion" .)