Crossword Genius

Colourless friend has energy (4)

Ross

I believe the answer is:

pale

'colourless' is the definition.
(similar in meaning)

'friend has energy' is the wordplay.
'friend' becomes 'pal' (pal can mean a friend).
'has' is a charade indicator (letters next to each other).
'energy' becomes 'e' (physics symbol as in E=mc2).
'pal'+'e'='PALE'

(Other definitions for pale that I've seen before include "White" , "Upright member" , "Stake, lacking colour" , "Wan; boundary" , "A bit of fencing" .)

I've seen this clue in The Mirror.
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