Appeal for odd sauce (3)
I believe the answer is:
sue
'appeal' is the definition.
(I've seen this before)
'odd sauce' is the wordplay.
'odd' means one should take alternating letters.
The alternate letters of 'sauce' are 'SUE'.
'for' acts as a link.
(Other definitions for sue that I've seen before include "Appeal" , "Institute legal proceedings (against someone)" , "Susan (dim.)" , "take to 10 [COURT] !" , "Take legal action against (someone), girl's name" .)