It's often tied up in property (4)
I believe the answer is:
rope
'it's often tied up' is the definition.
I can't tell whether this defines the answer.
'in property' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ROPE' is hidden within 'property'.
Can you help me to learn more?
(Other definitions for rope that I've seen before include "murder weapon" , "Enough to hang one?" , "Tier" , "Cable, cord, hawser" , "Guy" .)