Rock group gets drunk to eat whole chicken (10)
I believe the answer is:
stonehenge
'rock group' is the definition.
(I've seen this before)
'gets drunk to eat whole chicken' is the wordplay.
'drunk' is an anagram indicator.
'to eat' is an insertion indicator.
'whole' becomes 'one' (synonyms).
'chicken' becomes 'hen' (hen is a kind of chicken).
'gets' is an anagram of 'stge'.
'one'+'hen'='onehen'
'stge' enclosing 'onehen' is 'STONEHENGE'.
(Other definitions for stonehenge that I've seen before include "Ancient monument site" , "Wiltshire landmark" , "Prehistoric ruin, Salisbury Plain" , "[WILTS] monument" , "Wiltshire stone circle" .)