Set tea out in grounds (6)
I believe the answer is:
estate
'grounds' is the definition.
(I've seen this before)
'set tea out in' is the wordplay.
'set' becomes 'est' (I can't explain this - if you can you should give a lot more credence to this answer).
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'in' is an insertion indicator.
'tea' anagrammed gives 'ate'.
'est' placed into 'ate' is 'ESTATE'.
Can you help me to learn more?
(Other definitions for estate that I've seen before include "Italian summer" , "Property - may go with rank" , "Total possessions" , "Rank - housing development - what's left in a will" , "Rank - housing development - car" .)