An ass somewhere in Belgium (7)

I believe the answer is:

antwerp

'somewhere in belgium' is the definition.
(Belgian city)

'an ass' is the wordplay.
'ass' becomes 'twerp' (I've seen this before).
'an'+'twerp'='ANTWERP'

(Other definitions for antwerp that I've seen before include "New part of Dutch city" , "foreign city" , "Wrap net around this Belgian city" , "Van Dyck birthplace" , "Belgian city/port" .)

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