I'm looking for a four-letter answer to the following puzzle:
My coworker's apparantly hard to buy for.
A calender might make a good gift.
It's a consciencious man I'm dealing with.
He's indispensible in the work he does.
You are a
Every line has a word which is misspelled.
apparently - apparantly
calender - calendar
indispensible - indispensable
Thanks to @M Oehm
If we take the indexes of the incorrect letters and take related A..Z values, we get T, I, P, O which is again a misspelled TYPO which fits the pattern. Since, there's no riddle tag, this is all we need to look for.