Clue: A period of denial at home in the midst of a famous victory (9)
Answer: VALENTINE
Explanation: A period of denial at home in the midst of a famous victory (9)
An envelope ('in the midst of') of 'a' plus LENT ('period of denial') plus IN ('at home') in VE (Victory in Europe, celebrated on VE Day, 8 May 1945, 'a famous victory').