Mind about hotel's awfully small kitchen, originally seen in 1940s film (3,4,7)
I believe the answer is:
the lost weekend
'1940s film' is the definition.
'mind about hotel's awfully small kitchen originally seen in' is the wordplay.
'mind' becomes 'tend' (to tend is to look after or mind somebody).
'about' is an anagram indicator.
'awfully small' becomes 'wee' (similar in meaning. I am not sure about the 'awfully' bit.).
'originally' suggests taking the first letters.
'seen in' indicates putting letters inside.
The initial letter of 'kitchen' is 'k'.
'hotels' anagrammed gives 'helost'.
'helost'+'wee'+'k'='helostweek'
'tend' placed around 'helostweek' is 'THE LOST WEEKEND'.
Can you help me to learn more?
(Another definition for the lost weekend that I've seen is " Film".)