Place to stay during the last part of autumn (3)
I believe the answer is:
inn
'place to stay' is the definition.
(I've seen this before)
'during the last part of autumn' is the wordplay.
'during' becomes 'in' (I've seen this in other clues).
'the last part of autumn' becomes 'n' (I can't justify this - if you can you should give a lot more credence to this answer).
'in'+'n'='INN'
Can you help me to learn more?
(Other definitions for inn that I've seen before include "eg the Tabard" , "Hostel" , "European river" , "Resting place" , "Hotel or public house" .)