Tour leader took road around volcano emitting lava (6)
I believe the answer is:
travel
'tour' is the definition.
(I've seen this in another clue)
'leader took road around volcano emitting lava' is the wordplay.
'leader' suggests taking the first letters.
The initial letters of 'took road around volcano emitting lava' is 'TRAVEL'.
(Other definitions for travel that I've seen before include "Movement from one place to another" , "tour" , "Go on a trip" , "Make a journey" , "Go from place to place" .)