Thoughtful form of desecration (11)
I believe the answer is:
considerate
'thoughtful' is the definition.
(similar in meaning)
'form of desecration' is the wordplay.
'form of' is an anagram indicator (another form of the same letters).
'desecration' anagrammed gives 'CONSIDERATE'.
(Other definitions for considerate that I've seen before include "Careful not to harm or inconvenience others" , "Showing care" , "Unselfish" , "Kind" , "Thoughtful for the feelings of others" .)