Romantic joiner confined to cell, panicking over sex (9)
I believe the answer is:
candlelit
'romantic' is the definition.
(I've seen this before)
'joiner confined to cell panicking over sex' is the wordplay.
'joiner' becomes 'and' (I've seen this before).
'confined to' is an insertion indicator.
'panicking' is an anagram indicator.
'over' means one lot of letters go next to another.
'sex' becomes 'it' (a common euphemism).
'cell' is an anagram of 'clel'.
'and' going into 'clel' is 'candlel'.
'candlel'+'it'='CANDLELIT'
(Other definitions for candlelit that I've seen before include "Dimly illuminated" , "romantic setting" , "With dim illumination" , "Softer ambient setting" , "dim but romantic?" .)