Travel gave you endless trouble (6)
I believe the answer is:
voyage
'travel' is the definition.
(I know that voyage is a more specific form of the action the travel)
'gave you endless trouble' is the wordplay.
'endless' means to remove the last letter.
'trouble' is an anagram indicator.
'gave'+'you'='gaveyou'
'gaveyou' with its final letter taken off is 'gaveyo'.
'gaveyo' with letters rearranged gives 'VOYAGE'.
(Other definitions for voyage that I've seen before include "Cruise - passage" , "Journey by air or water" , "Long sea trip" , "Sea or space journey" , "Travel by water" .)