Crossword Genius

Forged Mona Lisa discovered by head of Christie's concerned with order? (7)

Ross

I believe the answer is:

masonic

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'concerned with order?' is the definition.
I can't tell whether this defines the answer.

'forged mona lisa discovered by head of christie's' is the wordplay.
'forged' indicates an anagram.
'discovered' indicates the central letters (dis-covered - outer letters removed).
'by' means one lot of letters go next to another.
'head of' says to take the initial letters.
The centre of 'lisa' is 'is'.
The initial letter of 'christie' is 'c'.
'mona'+'is'='monais'
'monais' is an anagram of 'masoni'.
'masoni'+'c'='MASONIC'

Can you help me to learn more?

(Other definitions for masonic that I've seen before include "Branch of secret male society" , "of lodgers?" , "Ma's coin (anag.)" , "relating to secret order" , "Like some lodges" .)

I've seen this clue in The Independent.
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