Colour cries out with energy (6)
I believe the answer is:
cerise
'colour' is the definition.
(cerise is a kind of colour)
'cries out with energy' is the wordplay.
'out with' indicates an anagram (out can mean wrong or inaccurate).
'energy' becomes 'e' (physics symbol as in E=mc2).
'cries' mixed up with 'e' gives 'CERISE'.
(Other definitions for cerise that I've seen before include "Cherry red colour" , "Light purplish red" , "Light clear red" , "Color of ripe cherries" , "'E cries at the colour red" .)