Criminally falsified data — not a particularly healthy state (3,2,1,6)
I believe the answer is:
fit as a fiddle
'particularly healthy state' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'criminally falsified data not a' is the wordplay.
'criminally' indicates anagramming the letters.
'not' suggests deleting specific letters.
'falsified'+'data'='falsifieddata'
'falsifieddata' with 'a' removed is 'flsifieddata'.
'flsifieddata' with letters rearranged gives 'FIT AS A FIDDLE'.
Can you help me to learn more?
(Other definitions for fit as a fiddle that I've seen before include "In very good health" , "Bouncing with health" , "What item must do to go into violin case" , "Flourishing" , "Extremely healthy" .)