Daughter wearing out a racing jacket (8)
I believe the answer is:
cardigan
'jacket' is the definition.
(I've seen this before)
'daughter wearing out a racing' is the wordplay.
I cannot really understand how this works, but
'daughter' could be 'd' (genealogical abbreviation) and 'd' is found within the answer.
'a' could be 'an' and 'an' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for cardigan that I've seen before include "in wardrobe?" , "Woollen jacket" , "Buttoned top" , "Knitted jacket" , "clothes item" .)