Bear in mind Mann left, of course, the one under par (6)

I believe the answer is:

birdie

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'one under par' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for birdie that I've seen before include "low score" , "One under in 20 across" , "One watched" , "In golf, a score of one under par for the hole" , "Golf score of one stroke under par" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.

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