Troubled by the worst conclusion that followed (6)
I believe the answer is:
tailed
'that followed' is the definition.
(I've seen this in another clue)
'troubled by the' is the wordplay.
'troubled' becomes 'ailed' ('ail' can be a synonym of 'trouble').
'by' is a charade indicator (letters next to each other).
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'ailed' put after 't' is 'TAILED'.
'worst conclusion' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for tailed that I've seen before include "Dogged" , "Followed like rear appendage" , "Followed, tracked" , "as a dog at the end" , "Followed by private detective, having rear appendage" .)