They are linked with land measures (6)
I believe the answer is:
chains
'measures' is the definition.
(chain is a kind of measure)
'they are linked with land' is the wordplay.
I cannot really understand how this works, but
'are' could be 'a' (short for 'are', historical unit of measurement) and 'a' is found in the answer.
The remaining letters 'chins' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for chains that I've seen before include "Restraints; series" , "Metal ropes with links (6)" , "Cash in (anag)" , "Restriction" , "Cash in for manacles and irons" .)