One leaves mangled genitals in knots (7)
I believe the answer is:
tangles
'knots' is the definition.
(I know this)
'one leaves mangled genitals' is the wordplay.
I cannot really see how this works, but
'one' could be 'an' (an apple is one apple) and 'an' is found in the answer.
This explanation may well be incorrect...
'in' acts as a link.
Can you help me to learn more?
(Other definitions for tangles that I've seen before include "Sent gal (anag.)" , "Knots" .)