Attractive gentleman in a bed, excited with large European (9)
I believe the answer is:
desirable
'attractive' is the definition.
(I've seen this before)
'gentleman in a bed excited with large european' is the wordplay.
'gentleman' becomes 'sir' (a man may be addressed as sir).
'in' indicates putting letters inside.
'excited with' is an anagram indicator.
'large' becomes 'L' (eg in clothes sizes).
'european' becomes 'E' (abbreviation e.g. EU).
'a'+'bed'='abed'
'abed' anagrammed with 'l' can make 'deabl'.
'sir' going into 'deabl' is 'desirabl'.
'desirabl'+'e'='DESIRABLE'
(Other definitions for desirable that I've seen before include "handsome maybe" , "Worth having" , "Alluring" , "Attractive" , "Pleasing" .)