Royalist going crazy on his own? (8)

I believe the answer is:

solitary

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'on his own?' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?

'royalist going crazy' is the wordplay.
'going crazy' indicates anagramming the letters.
'royalist' is an anagram of 'SOLITARY'.

Can you help me to learn more?

(Other definitions for solitary that I've seen before include "reclusive" , "punishment" , "Secluded, isolated" , "friendless" , "Recluse" .)

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