The most common and most likely answer to this crossword clue is the 7 plus 1 letter word AVERSE} –
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Buddy explains!

The straight part
We know that "Reluctant to" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case reluctant to = averse} –.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 AVERSE} – mean?
AVERSE} – verb- To turn away.
- Having a repugnance or opposition of mind.
- Turned away or backward.
- Lying on the opposite side (to or from).
- Turned so as to show the back, as of a right hand.