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 'on' (I can't explain this - if you can you should give a lot more credence to this answer).
'academician' becomes 'ara'.
'say'+'on'+'ara'='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" .)