Article on port, town in Hampshire (7)
I believe the answer is:
andover
'town in hampshire' is the definition.
(I've seen this before)
'article on port' is the wordplay.
'article' becomes 'an' (indefinite article).
'on' means one lot of letters go next to another.
'port' becomes 'dover' (I've seen this before).
'an'+'dover'='ANDOVER'
(Other definitions for andover that I've seen before include "Town in Hampshire" , "New town development" , "Hants town" .)