Fancy -- exhausted Romeo gets firm twice! (6)
I believe the answer is:
rococo
'fancy' is the definition.
(similar in meaning)
'exhausted romeo gets firm twice' is the wordplay.
'exhausted' suggests removing the centre (the word is emptied out or exhausted).
'gets' is a charade indicator (letters next to each other).
'firm' becomes 'co' (a firm is a company).
'twice' indicates the doubling of some letters.
'romeo' with its middle taken out is 'ro'.
'co' duplicated is 'coco'.
'ro'+'coco'='ROCOCO'
(Other definitions for rococo that I've seen before include "Ornamental style associated with Louis XV" , "Late Baroque artistic style" , "Ornate architectural style" , "Fanciful decoration" , "18th-century French style" .)