A useful tip I learned for differentiating Red Bishop from most other euplectes species: See how far the tail feathers extend past the undertail coverts? On a Bishop, the undertail coverts extend almost as far as the tail tip. Therefore your bird is not a Red Bishop, but unfortunately I can't tell you what it IS!
I feel it might me Red-collared, but unsure how to rule out White-tinged Widow.
Hope this helps somewhat