Same sort of hem (4)
I believe the answer is:
seam
'hem' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?
'same sort' is the wordplay.
'sort' is an anagram indicator.
'same' is an anagram of 'SEAM'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for seam that I've seen before include "Stratum (of a mineral)" , "Join - stratum of ore" , "Fabric joint" , "The line where two edges are stitched together" , "Join in knitted garment" .)