How to secure admission in kind way that careless writer might get wrong (15)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

not sure how to parse this, but perhaps two definitions: "How to secure admissions" – admission to an event might be achieved complimentarily i.e. for free "in kind way" – words can be used complimentarily to say kind things then the rest of the clue indicates that this is a word that might be spelled incorrectly as complEmentarily