Travel wearing explosive weapon (7)
I believe the answer is:
trident
'weapon' is the definition.
(I know that trident is a type of lance)
'travel wearing explosive' is the wordplay.
'travel' becomes 'ride' (eg to ride a bus).
'wearing' is an insertion indicator.
'explosive' becomes 'tnt' (TNT is an example).
'ride' placed inside 'tnt' is 'TRIDENT'.
(Other definitions for trident that I've seen before include "Nuclear missile" , "Fork perhaps" , "spear carried at sea" , "Neptune's or Britannia's spear" , "Three-pointed spear" .)