Worry about pal dancing without over-the-shoulder support (9)
I believe the answer is:
strapless
'without over-the-shoulder support' is the definition.
I can't judge whether this definition defines the answer.
'worry about pal dancing' is the wordplay.
'worry' becomes 'stress' (I've seen this before).
'about' is an insertion indicator.
'dancing' indicates anagramming the letters.
'pal' with letters rearranged gives 'apl'.
'stress' enclosing 'apl' is 'STRAPLESS'.
Can you help me to learn more?
(Other definitions for strapless that I've seen before include "As dress may be" , "off one's shoulders" , "Daring dress is so" , "lacking support" .)