A batch of loaves? That’s odd, maybe unlucky (8)
I believe the answer is:
thirteen
This clue is a triple definition!
'a batch of loaves?' is the first definition.
(as in a baker's dozen)
'that's odd' is the second definition.
(odd number)
'maybe unlucky' is the third definition.
(unlucky number)
(Other definitions for thirteen that I've seen before include "Number at Last Supper" , "Some consider it unlucky" , "ill-omened figure" , "Cardinal" , "13" .)