Log involved honour in despondency (5)
I believe the answer is:
gloom
'despondency' is the definition.
(I've seen this in another clue)
'log involved honour' is the wordplay.
'involved' is an anagram indicator (involved can mean confusing or complex).
'honour' becomes 'om'.
'log' with letters rearranged gives 'glo'.
'glo'+'om'='GLOOM'
'in' is the link.
(Other definitions for gloom that I've seen before include "Obscurity or melancholy" , "Dimness" , "Near-darkness - misery" , "Despondency" , "Betting figures" .)