She's very alluring in the first sixty minutes (5)
I believe the answer is:
houri
'she's very alluring' is the definition.
(a houri is a beautiful woman in paradise in Islam)
'in the first sixty minutes' is the wordplay.
'in the' becomes 'i' (this might be a standard abbreviation I've not previously seen).
'first' says to put letters next to each other.
'sixty minutes' becomes 'hour' (I've seen this before).
'i' put after 'hour' is 'HOURI'.
(Other definitions for houri that I've seen before include "Paradisal nymph" , "Young beautiful woman of the Moslem Paradise" , "Virgin companion of the Muslim faithful in Paradise" , "Alluring woman or nymph in Muslim paradise" , "Girl in Muslim paradise" .)