Lisa managed to go by boat (4)
I believe the answer is:
sail
'go by boat' is the definition.
(I've seen this in another clue)
'lisa managed' is the wordplay.
'managed' is an anagram indicator.
'lisa' with letters rearranged gives 'SAIL'.
'to' acts as a link.
(Other definitions for sail that I've seen before include "Leave harbour" , "Go by water" , "Canvas on board" , "Ship's canvas" , "Glide along" .)