Conductor to choose right composition (9)
I believe the answer is:
electrode
'conductor' is the definition.
(electrode is a kind of conductor)
'choose right composition' is the wordplay.
I cannot really understand how this works, but
'choose' could be 'elect' (electing is a kind of choosing) and 'elect' is found within the answer.
'right' could be 'r' (common abbreviation) and 'r' is located in the answer.
'composition' could be 'ode' (I've seen this before) and 'ode' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'to' is the link.
Can you help me to learn more?
(Other definitions for electrode that I've seen before include "Conductor making contact in a circuit" , "Conductor for electricity as it enters or leaves" , "Conductor (eg, in battery)" , "Terminal of, eg, an acid battery" , "Conducting terminal" .)