Staff travelled endlessly (3)
I believe the answer is:
rod
'staff' is the definition.
(both can mean a pole or stick)
'travelled endlessly' is the wordplay.
'travelled' becomes 'rode' (eg travelled on a horse).
'endlessly' means to remove the last letter.
'rode' with its last letter taken off is 'ROD'.
(Other definitions for rod that I've seen before include "Fisherman's item" , "Long, straight stick" , "Stick - bar" , "something fisherman brings home" , "axle" .)