At the end of August, the house is overheated (3)
I believe the answer is:
hot
'is overheated' is the definition.
(similar in meaning)
'at the end of august the house' is the wordplay.
'at' says to put letters next to each other.
'the end of' says to take the final letters.
'the house' becomes 'ho' (abbreviation for house).
The last letter of 'august' is 't'.
't' put after 'ho' is 'HOT'.
(Other definitions for hot that I've seen before include "Sultry in psychotic way" , "recently stolen" , "Intense - illegal - dangerous" , "'Strike while the iron is ...'" , "Sultry or angry" .)