Morning employed in being entertained (6)
I believe the answer is:
amused
'being entertained' is the definition.
('amused' can be a synonym of 'entertained')
'morning employed' is the wordplay.
'morning' becomes 'am'.
'employed' becomes 'used' ('use' can be a synonym of 'employ').
'am'+'used'='AMUSED'
'in' acts as a link.
(Other definitions for amused that I've seen before include "Mildly entertained by Medusa" , "happily occupied" , "Medusa (anag)" , "Pleasantly occupied" , "Tickled pink" .)