Conductor travelled behind chosen few (9)
I believe the answer is:
electrode
'conductor' is the definition.
(electrode is a kind of conductor)
'travelled behind chosen few' is the wordplay.
'travelled' becomes 'rode' (eg travelled on a horse).
'behind' says to put letters next to each other.
'chosen few' becomes 'elect' (I've seen this in another clue).
'rode' after 'elect' is 'ELECTRODE'.
(Other definitions for electrode that I've seen before include "Connecting conductor" , "Conductor for electricity as it enters or leaves" , "Conductor by which current enters" , "Conductor (eg, in battery)" , "Conductor making contact in a circuit" .)