Swampy spot (4)
I believe the answer is:
mire
'swampy spot' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for mire that I've seen before include "Mud - bog" , "(Stretch of) clinging mud" , "Emir found in mud" , "Marsh" , "Bog down in swamp" .)