Royal house's last to entertain lavishly (6)

I believe the answer is:

regale

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'entertain lavishly' is the definition.
(I've seen this in another clue)

'royal house's last to' is the wordplay.
'royal' becomes 'r' (common abbreviation e.g. RM - Royal Marine).
'last' indicates one should take the final letters.
'to' becomes 'gale' (I am not sure about this - if you are sure you should believe this answer much more).
The last letter of 'house' is 'e'.
'r'+'e'+'gale'='REGALE'

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(Other definitions for regale that I've seen before include "Feed or entertain well" , "Entertain with conversation" , "Generously entertain (with)" , "Entertain lavishly" , "Entertain royally" .)

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