Old Queen title, not empty decoration (8)
I believe the answer is:
ornament
'decoration' is the definition.
(I've seen this before)
'old queen title not empty' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'queen' becomes 'r' (r is abbreviation regina. e.g. in ER ).
'title' becomes 'name' (I've seen this before**).
'empty' means to remove the middle letters.
'not' with its middle taken out is 'nt'.
'o'+'r'+'name'+'nt'='ORNAMENT'
(Other definitions for ornament that I've seen before include "Something decorative" , "composers can provide in a shake" , "It's used to adorn" , "Trinket - decoration" , "A mark of honour" .)