The Spanish castle I wander round is simply heavenly (9)

I believe the answer is:

celestial

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'simply heavenly' is the definition.
'celestial' can be an answer for 'heavenly' (synonyms). I'm not certain of the 'simply' bit.

'the spanish castle i wander round' is the wordplay.
'the spanish' becomes 'el' ('the' in Spanish).
'wander' is an anagram indicator.
'round' is an insertion indicator.
'castle'+'i'='castlei'
'castlei' is an anagram of 'cestial'.
'el' inserted within 'cestial' is 'CELESTIAL'.

'is' acts as a link.

Can you help me to learn more?

(Other definitions for celestial that I've seen before include "Relating to the heavens" , "Heavenly" .)

I've seen this clue in the Evening Standard.

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