She gets one day a year off (3)
I believe the answer is:
ida
'she' is the definition.
(I've seen this before)
'one day a year off' is the wordplay.
'one' becomes 'i' (Roman numeral).
'a year' becomes 'y'.
'off' indicates named letters should be taken away (some letters taken off).
'day' with 'y' removed is 'da'.
'i'+'da'='IDA'
'gets' acts as a link.
(Other definitions for ida that I've seen before include "Classic mount" , "Name of girl or mountain" , "Poetic princess" , "lady" , "Trojan Mount; G&S Princess" .)