Relative odds cut in mixed crew (5)
I believe the answer is:
niece
'relative' is the definition.
(type of relative)
'odds cut in mixed crew' is the wordplay.
'odds cut' means one should take alternating letters (odd-numbered letters are removed).
'in'+'mixed'+'crew'='inmixedcrew'
The alternate letters of 'inmixedcrew' are 'NIECE'.
(Other definitions for niece that I've seen before include "[PRIEST'S] daughter?" , "Family relative" , "member of different generation" , "Family girl" , "Preparation for curdling milk" .)