Style and energy required for tribe with no leader (4)
I believe the answer is:
elan
'style' is the definition.
(I know that style can be written as elan)
'energy required for tribe with no leader' is the wordplay.
'energy' becomes 'e' (physics symbol as in E=mc2).
'required for' becomes 'l' (I am not sure about this - if you are sure you should believe this answer much more).
'tribe' becomes 'dan' (one of the Tribes of Israel).
'with no leader' means to remove the first letter.
'dan' with its first letter removed is 'an'.
'e'+'l'+'an'='ELAN'
'and' is the link.
Can you help me to learn more?
(Other definitions for elan that I've seen before include "Grass with edible grains" , "fizz" , "Stylish verve" , "Flamboyance" , "Dash in France" .)