Crossword Genius

Gaff about Andrew's first royal residence (6)

Ross

I believe the answer is:

palace

I'm a little stuck... Click here to teach me more about this clue!

'royal residence' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for palace that I've seen before include "Locality round a monarch's official residence" , "Regal mansion" , "See 23" , "Grand building" , "Official residence of a sovereign" .)

I've seen this clue in The Telegraph.
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