Loose change once her tin ... (10)
I believe the answer is:
incoherent
'loose' is the definition.
(thesaurus)
'change once her tin' is the wordplay.
'change' is an anagram indicator.
'once'+'her'+'tin'='oncehertin'
'oncehertin' anagrammed gives 'INCOHERENT'.
(Other definitions for incoherent that I've seen before include "difficult to understand" , "Internally inconsistent" , "drunk?" , "Unintelligible" , "rambling" .)