Bird with body odour turns up right before umpire’s ruling (5)
I believe the answer is:
robin
'bird' is the definition.
(I know that robin is a type of oscine)
'body odour turns up right before umpire's ruling' is the wordplay.
'body odour' becomes 'bo' (synonyms).
'turns up' is a reversal indicator.
'right' becomes 'r' (abbreviation).
'before' is a charade indicator (letters next to each other).
'umpire's ruling' becomes 'in' (I can't explain this - if you can you should give a lot more credence to this answer).
'bo' backwards is 'ob'.
'ob' after 'r' is 'rob'.
'rob'+'in'='ROBIN'
'with' acts as a link.
Can you help me to learn more?
(Other definitions for robin that I've seen before include "Bird, killed by Sparrow" , "Day was one" , "Red-breasted songbird" , "Bird on many cards" , "Batman's assistant" .)