Astrid finally devoured boyfriend (4)
I believe the answer is:
date
'boyfriend' is the definition.
(I've seen this in other clues)
'astrid finally devoured' is the wordplay.
'finally' indicates one should take the final letters.
'devoured' becomes 'ate' (I've seen this in another clue).
The final letter of 'astrid' is 'd'.
'd'+'ate'='DATE'
(Other definitions for date that I've seen before include "Day, month and year" , "Sticky fruit" , "Fruit with stone" , "Small fruit or social appointment" , "Romantic appointment" .)