Song, for example, right to be included by tenors performing (2,7)

'song' is the definition.
(English title of 'Non, je ne regrette rien')

'example right to be included by tenors performing' is the wordplay.
'example' becomes 'eg'.
'right' becomes 'r' (common abbreviation).
'to be included by' means one lot of letters goes inside another.
'performing' is an anagram indicator.
'eg'+'r'='egr'
'tenors' anagrammed gives 'norets'.
'egr' inserted within 'norets' is 'NO REGRETS'.

'for' acts as a link.