Flog junk round hotel (6)
I believe the answer is:
thrash
'flog' is the definition.
(both can mean to beat)
'junk round hotel' is the wordplay.
'junk' becomes 'trash' (synonyms).
'round' is an insertion indicator.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'trash' enclosing 'h' is 'THRASH'.
(Other definitions for thrash that I've seen before include "worst > party" , "Beat with stick or whip" , "Decisively beat" , "Beat thoroughly or make wild movements" , "Best" .)