Pleased with day after morning exercise (6)
I believe the answer is:
amused
'pleased' is the definition.
(similar in meaning)
'day after morning exercise' is the wordplay.
'day' becomes 'd'.
'after' is a charade indicator (letters next to each other).
'morning' becomes 'am'.
'exercise' becomes 'use' (synonyms).
'am'+'use'='amuse'
'd' after 'amuse' is 'AMUSED'.
'with' acts as a link.
(Other definitions for amused that I've seen before include "happily occupied" , "Tickled pink" , "Medusa (anag)" , "Pleasantly occupied" , "Delighted" .)