Druid oddly is no good (3)
I believe the answer is:
dud
'no good' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?
'druid oddly' is the wordplay.
'oddly' means one should take alternating letters (letters in the odd-numbered positions are used).
The alternate letters of 'druid' are 'DUD'.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for dud that I've seen before include "Useless, ineffective" , "Non-functioning thing" , "Useless, doesn't work - a palindrome" , "Phoney" , "Explosive not detonating" .)