From Somerset, he'd taken the daughter in the car (7)
I believe the answer is:
cheddar
'from somerset he'd taken the daughter in the car' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'he'd taken the daughter in the car' is the wordplay.
'taken' means one lot of letters go next to another.
'the daughter' becomes 'd' (genealogical abbreviation).
'in the' is an insertion indicator.
'hed'+'d'='hedd'
'hedd' put inside 'car' is 'CHEDDAR'.
Can you help me to learn more?
(Other definitions for cheddar that I've seen before include "Type of cheese" , "Hard cheese" , "English cheese variety" , "Mendip gorge" , "part of ploughman's lunch" .)