From Somerset, he’d taken the daughter in the car (7)
I believe the answer is:
Here is my best explanation:
'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 understand how one could define the other.
'he'd taken the daughter in the car' is the wordplay.
'taken' says to put letters next to each other.
'the daughter' becomes 'd'.
'in the' means one lot of letters goes inside another.
'hedd' going into 'car' is 'CHEDDAR'.
(Other definitions for cheddar that I've seen before include "A cheese", "Hard cheese", "Here one may get to gorge", "Mendip gorge", "kind", "Gorge with caves - cheese", "English cheese variety", "Cheese originally from Somerset", "Type of cheese" and "Popular cheese originally from Somerset".)