Article about foul place is unpleasant (5)
I believe the answer is:
nasty
'unpleasant' is the definition.
(nasty can mean unpleasant or horrible)
'article about foul place' is the wordplay.
'article' becomes 'an' (indefinite article).
'about' says the letters should be written in reverse.
'foul place' becomes 'sty' (I've seen this in another clue).
'an' reversed gives 'na'.
'na'+'sty'='NASTY'
'is' is the link.
(Other definitions for nasty that I've seen before include "Evil" , "One who sees the future" , "Not nice" , "Spiteful and unkind" , "Horrible" .)