Skinhead to defame leader failing to relax (7)
I believe the answer is:
slacken
'relax' is the definition.
(I know that relax can be written as slacken)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for slacken that I've seen before include "Ease off (work)" , "Loosen -- become less busy" , "relax" , "Make looser" , "reduce tension" .)