Seriously and sorely upset about a bad start (7)
I believe the answer is:
soberly
'seriously' is the definition.
(thesaurus)
'sorely upset about a bad start' is the wordplay.
'upset' is an anagram indicator.
'about' is an insertion indicator.
'start' indicates taking the first letters.
The initial letter of 'bad' is 'b'.
'sorely' with letters rearranged gives 'soerly'.
'soerly' going around 'b' is 'SOBERLY'.
'and' is the link.
(Another definition for soberly that I've seen is " In a non-alcoholic manner.".)
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