The most common and most likely answer to this crossword clue is the 4 plus 4 letter word CALF LOVE
I've seen this crossword clue in The Times
C
A
L
F
L
O
V
E
More clues leading to the result CALF LOVE
Buddy explains!

The straight part
We know that "Infatuation" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case infatuation = calf love.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.