Not good to dry out? That’s bad! (7)
I believe the answer is:
devilry
'bad' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'not good to dry out?' is the wordplay.
'not good' becomes 'evil' ('evil' is the opposite to 'good').
'out?' means one lot of letters goes inside another.
'evil' put inside 'dry' is 'DEVILRY'.
'that's' is the link.
Can you help me to learn more?
(Other definitions for devilry that I've seen before include "It's sheer malice" , "wicked behaviour" , "Wicked activity" , "wicked stuff" , "wickedness" .)