For Queen single I cavort about outside (8)
I believe the answer is:
victoria
'for queen' is the definition.
(Victoria is an example)
'single i cavort about outside' is the wordplay.
'single' becomes 'i' (one).
'about' is an anagram indicator.
'outside' means one lot of letters goes inside another.
'i'+'cavort'='icavort'
'icavort' with letters rearranged gives 'victora'.
'i' inserted into 'victora' is 'VICTORIA'.
(Other definitions for victoria that I've seen before include "Wood" , "I will be good she said" , "falls in > London station" , "Tree; part of hand" , "one wasn't amused" .)