Perceive a voyage beset with trouble (6)
I believe the answer is:
assail
'trouble' is the definition.
(assail can mean to trouble or worry)
'perceive a voyage beset' is the wordplay.
I cannot really understand how this works, but
'a' is present in the answer.
'voyage' could be 'sail' (synonyms) and 'sail' is located in the answer.
A single letter 's' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'with' acts as a link.
Can you help me to learn more?
(Other definitions for assail that I've seen before include "Aggressively attack" , "Attack, lash out" , "Criticize" , "Charge" , "storm" .)