The most common and most likely answer to this crossword clue is the 3 plus 2 letter word TIE IN
I've seen this crossword clue in The Guardian
T
I
E
I
N
More clues leading to the result TIE IN
Buddy explains!

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.
What does TIE IN mean?
TIE IN noun- Something that is related or connected to another
- An authorized product based on a media property, such as a film or video game, by way of cross-promotion.
- An association or connection between things