The wish of one hiding in the matted reeds (6)
I believe the answer is:
desire
'the wish' is the definition.
(I've seen this in another clue)
'one hiding in the matted reeds' is the wordplay.
I cannot really understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
an anagram of 'reeds' is 'desre' which is located in the left over letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'of' is the link.
Can you help me to learn more?
(Other definitions for desire that I've seen before include "Long for (something)" , "Covet" , "Want, wish for" , "Strong wish" , "Want strongly" .)