Fix on a stake since I have lost colour (6)
I believe the answer is:
impale
'fix on a stake' is the definition.
(I've seen this in another clue)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for impale that I've seen before include "Puncture" , "Pierce, run through" , "Run through with stake" , "Pierce through as with sharp stick" , "Skewer" .)