Rubbish written about head of hunting party (6)
I believe the answer is:
thrash
'party' is the definition.
(I've seen this before)
'rubbish written about head of hunting' is the wordplay.
'rubbish' becomes 'trash' ('trash' can be a synonym of 'rubbish'**).
'written about' is an insertion indicator.
'head of' says to take the initial letters.
The first letter of 'hunting' is 'h'.
'trash' placed around 'h' is 'THRASH'.
(Other definitions for thrash that I've seen before include "Clobber" , "Decisively beat" , "Beat violently" , "Beat thoroughly or make wild movements" , "Best" .)