Label attached to head of Socialist party? (4)
I believe the answer is:
stag
'party?' is the definition.
(thesaurus)
'label attached to head of socialist' is the wordplay.
'label' becomes 'tag' ('tag' can be a synonym of 'label'**).
'attached to' is a charade indicator (letters next to each other).
'head of' says to take the initial letters.
The first letter of 'socialist' is 's'.
'tag' put after 's' is 'STAG'.
(Other definitions for stag that I've seen before include "Investor" , "Male animal" , "animal of the deer family" , "one may get in a rut" , "Hunted animal" .)