Pretentious fellow with obligation to accommodate Queen (8)
I believe the answer is:
mannered
'pretentious' is the definition.
(thesaurus)
'fellow with obligation to accommodate queen' is the wordplay.
'fellow' becomes 'man' (I've seen this before**).
'with' means one lot of letters go next to another.
'obligation' becomes 'need'.
'to accommodate' means one lot of letters goes inside another.
'queen' becomes 'r' (r is abbreviation regina. e.g. in ER ).
'need' placed around 'r' is 'nered'.
'man'+'nered'='MANNERED'
(Other definitions for mannered that I've seen before include "unnatural" , "Artificial, pretentious" , "Acting with exaggerated behaviour" , "Idiosyncratic" , "Given to polite social behaviour" .)