Sad old fools or rogues, just not the odd ones (8)
I believe the answer is:
dolorous
'sad' is the definition.
(I've seen this in another clue)
'old fools or rogues just not the odd ones' is the wordplay.
I cannot really see how this works, but
an anagram of 'old' is 'dol' which is present in the answer.
'or' is within the answer.
'not' could be 'o' (I've seen this in other clues) and 'o' is found within the answer.
The remaining letters 'us' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for dolorous that I've seen before include "Grief stricken" , "Feeling great sorrow" .)