Bertie -, taoiseach who signed the Good Friday agreement in 1998 (5)

I believe the answer is:

ahern

(Other definitions for ahern that I've seen before include "Bertie, Taioseach" , "Leader of 29 down" , "Bertie, main political man" , "He ran badly but was elected" .)

I've seen this clue in The Times.

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