Clanger: left out large fixed capital (7)
I believe the answer is:
belfast
'capital' is the definition.
(Belfast is an example)
'clanger left out large fixed' is the wordplay.
'clanger' becomes 'bell' (something which clangs).
'left out' indicates named letters should be taken away.
'large' becomes 'l'.
'fixed' becomes 'fast' (synonyms).
'bell' with 'l' removed is 'bel'.
'bel'+'fast'='BELFAST'
(Other definitions for belfast that I've seen before include "NI city" , "N. Ireland city" , "Capital of Northern Ireland" , "Northern Ireland city" , "Northern Ireland home to Queen's University" .)