Sort out high night rates (10)
I believe the answer is:
straighten
'sort out' is the definition.
(thesaurus)
'high night rates' is the wordplay.
'high' indicates an anagram (like drunk).
'night'+'rates'='nightrates'
'nightrates' anagrammed gives 'STRAIGHTEN'.
(Other definitions for straighten that I've seen before include "Unbend, align" , "Get in line" , "put back in order" , "put in alignment?" , "Shattering (anag) - unbend" .)