Steward ever so disturbed by the end of the voyage (5)
I believe the answer is:
reeve
'steward' is the definition.
(I've seen this before)
'ever so disturbed by the end of the voyage' is the wordplay.
'ever so' becomes 'reve' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'disturbed by' is an insertion indicator (inserted letters disturb or break up the word).
'the end of the' says to take the final letters.
The last letter of 'voyage' is 'e'.
'reve' enclosing 'e' is 'REEVE'.
Can you help me to learn more?
(Other definitions for reeve that I've seen before include "Scottish bailiff" , "Bailiff, steward" , "magistrate of long ago" , "Old English magistrate or bailiff" , "estate supervisor" .)