Modify a dwelling on return at end of August (5)
I believe the answer is:
adapt
'modify' is the definition.
(I've seen this before)
'a dwelling on return at end of august' is the wordplay.
'dwelling on return at' becomes 'dap' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'end of' suggests the final letters.
The final letter of 'august' is 't'.
'a'+'dap'+'t'='ADAPT'
Can you help me to learn more?
(Other definitions for adapt that I've seen before include "Adjust (to new condition)" , "Become adjusted to new circumstances" , "Accommodate" , "Adjust to new use" , "Change to suit new circumstances" .)