Upset in dance venue, joining swimming centre with daughter (12)
I believe the answer is:
disconcerted
'upset' is the definition.
(thesaurus)
'dance venue joining swimming centre with daughter' is the wordplay.
'dance venue' becomes 'disco' (I've seen this before).
'joining' is a charade indicator (letters next to each other).
'swimming' is an anagram indicator.
'with' is a charade indicator (letters next to each other).
'daughter' becomes 'd'.
'centre' with letters rearranged gives 'ncerte'.
'disco'+'ncerte'+'d'='DISCONCERTED'
'in' acts as a link.
(Other definitions for disconcerted that I've seen before include "Unsettled" , "All shook up"" , "Disturbed the composure of" , "Second credit (anag) - thrown" .)