Lying article in Paris Match heartily hurtful rubbish (10)

'lying' is the definition.
(similar in meaning)

'article in paris match heartily hurtful rubbish' is the wordplay.
'article in paris' becomes 'un' (indefinite article in French).
'heartily' means to look at the middle letters (the inside or heart of the word).
'rubbish' is an anagram indicator (a poor quality or rubbish spelling of the letters).
The central letter of 'match' is 't'.
'hurtful' is an anagram of 'ruthful'.
'un'+'t'+'ruthful'='UNTRUTHFUL'