Beat for writing rubbish about human head (6)
I believe the answer is:
thrash
'beat for' is the definition.
'thrash' can be an answer for 'beat' (thrashing is a kind of beating). I am not sure about the 'for' bit.
'rubbish about human head' is the wordplay.
'rubbish' becomes 'trash' (synonyms).
'about' indicates putting letters inside.
'head' indicates taking the first letters.
The initial letter of 'human' is 'h'.
'trash' going around 'h' is 'THRASH'.
'writing' acts as a link.
Can you help me to learn more?
(Other definitions for thrash that I've seen before include "Flog; party" , "Beat with stick or whip" , "Administer severe beating to" , "Soundly defeat; party" , "Beat heavily, perhaps with whip" .)