Camp bed that is supporting Queen (7)
I believe the answer is:
coterie
'camp' is the definition.
('coterie' can be a synonym of 'camp')
'bed that is supporting queen' is the wordplay.
'bed' becomes 'cot' (cot is a kind of bed).
'that is' becomes 'ie' ('i.e.' can be a synonym of 'that is').
'supporting' means one lot of letters go next to another (in a down clue, some letters go below others).
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
'ie' put after 'er' is 'erie'.
'cot'+'erie'='COTERIE'
(Other definitions for coterie that I've seen before include "Small exclusive circle with a common purpose" , "Small exclusive group of people" , "Select group" , "EEC trio in exclusive group" , "Exclusive social circle" .)