Happily starting tomorrow in a new play (5)
I believe the answer is:
aptly
'happily' is the definition.
Both the definition and answer are adverbs. Perhaps they are linked in a way I don't understand?
'starting tomorrow in a new play' is the wordplay.
'starting' suggests taking the first letters.
'in' is an insertion indicator.
'a new' indicates anagramming the letters.
The initial letter of 'tomorrow' is 't'.
'play' with letters rearranged gives 'aply'.
't' put into 'aply' is 'APTLY'.
Can you help me to learn more?
(Other definitions for aptly that I've seen before include "Appropriately" , "In an appropriate way" , "Fittingly" , "In suitable fashion" , "as is fitting" .)