Getting nude isn't grand, changing (13)

Ross

I believe the answer is:

understanding

'getting' is the definition.
(get can mean to understand or appreciate)

'nude isn't grand changing' is the wordplay.
'changing' is an anagram indicator.
'nude'+'isnt'+'grand'='nudeisntgrand'
'nudeisntgrand' anagrammed gives 'UNDERSTANDING'.

(Other definitions for understanding that I've seen before include "Gathering" , "Empathy" , "compassionate" , "perception" , "Discernment" .)

I've seen this clue in The Telegraph.

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