Rug gets round part of defence (4)
I believe the answer is:
moat
'defence' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'rug gets round part' is the wordplay.
'rug' becomes 'mat' (I've seen this before).
'gets round' becomes 'o' (I've seen this in other clues).
'part' is an insertion indicator (the inserted letters split open or part the word).
'mat' going around 'o' is 'MOAT'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for moat that I've seen before include "Water defence" , "Castle's ditch" , "Ditch dug to protect a castle" , "Water-filled trench around a castle" , "Water-filled ditch around stronghold" .)