Rest of Belgium quite bored by Ghent's centre (8)
I believe the answer is:
breather
'rest' is the definition.
(I know that breather is a type of rest)
'belgium quite bored by ghent's centre' is the wordplay.
'belgium' becomes 'B' (abbreviation for Belgium).
'quite' becomes 'rather' (synonyms).
'bored by' is an insertion indicator (to bore something can mean to drill into it).
'centre' means to look at the middle letters.
The central letter of 'ghent' is 'e'.
'rather' enclosing 'e' is 'reather'.
'b'+'reather'='BREATHER'
'of' acts as a link.
(Other definitions for breather that I've seen before include "Short rest break" , "Brief pause for rest" , "time off work" , "A rest from work - rather be thus" , "A rest - lung?" .)