Sadly stood up without second dance (5)
I believe the answer is:
salsa
'dance' is the definition.
(I've seen this before)
'sadly stood up without second' is the wordplay.
'sadly' becomes 'alas' (I've seen this before).
'stood up' shows that the letters should be reversed in order (in a down clue, letters go up).
'without' indicates putting letters inside ('without' can be similar in meaning to 'outside').
'second' becomes 's' (common abbreviation).
'alas' back-to-front is 'sala'.
'sala' placed around 's' is 'SALSA'.
(Other definitions for salsa that I've seen before include "Sauce; Afro-Cuban dance" , "that's hot and saucy?" , "dancing?" , "The Latin-American sound" , "Spicy 7" .)