Made out the sow had been let loose in the fields (7)
I believe the answer is:
meadows
'the fields' is the definition.
(I've seen this before)
'made out the sow had been let loose' is the wordplay.
I cannot really understand how this works, but
an anagram of 'made' is 'mead' which is within the answer.
an anagram of 'sow' is 'ows' which is present in the answer.
No letters remain.
This explanation may well be incorrect...
'in' is the link.
Can you help me to learn more?
(Other definitions for meadows that I've seen before include "Fields for making hay" , "where you find grasses" , "Hayfields" , "As mowed (anag)" , "Grassy fields" .)