Showed contempt, and guided leader from Tesla to become Nationalist (7)

I believe the answer is:
sneered
'showed contempt' is the definition.
(I've seen this in another clue)
'guided leader from tesla to become nationalist' is the wordplay.
I cannot quite understand how this works, but
'leader' could be 'red' (red is a kind of leader) and 'red' is present in the answer.
'nationalist' could be 'n' (abbreviation in politics) and 'n' is present in the answer.
The remaining letters 'see' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'and' is the link.
Can you help me to learn more?
(Other definitions for sneered that I've seen before include "Was contemptuous" , "Smiled contemptuously" , "Derided" , "Mocked contemptuously" , "Showed contempt" .)