Clue: Head of government's French bird almost mangê par mauvais chat (9)
Answer: TAOISEACH
Explanation: Definition: Head of government
An envelope ('mangé par' – the circumflex is a misprint) of OISEA[u] ('French bird')~~ misprint,~~ minus the last letter ('almost') in TACH, an anagram ('mauvais') of 'chat', for the Prime Minister of the Republic of Ireland. Even without the misprint, not the happiest of macaronic clues, I feel.