Farewell remark respecting a Royal Academician (8)
I believe the answer is:
sayonara
'farewell' is the definition.
(sayonara is a kind of farewell)
'remark respecting a royal academician' is the wordplay.
'remark' becomes 'say'' (to remark something is to say it).
'respecting a royal' becomes 'ona' (I am not sure about this - if you are sure you should believe this answer much more).
'academician' becomes 'RA' (member of the Royal Academy of Arts).
'say'+'ona'+'ra'='SAYONARA'
Can you help me to learn more?
(Other definitions for sayonara that I've seen before include "So long" , "Goodbye (Jap.)" , "Japanese goodbye" , "Japanese farewell" , "Goodbye or farewell in Japan" .)