Badly observed, as a joint? (5)
I believe the answer is:
cased
'badly observed' is the definition.
The answer and definition can be both to do with perception as well as being past participle verbs.
Maybe they are linked in a way I don't understand?
'as a joint?' is the wordplay.
I cannot quite see how this works, but
'as' is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for cased that I've seen before include "Covered, protected; checked over (by robber)" , "Reconnoitred (sl.)" , "Carefully inspected (for crime)" , "examined with intention to rob" , "put in a box" .)