The most common and most likely answer to this crossword clue is the 5 letter word HOSEL
H
O
S
E
L
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The straight part
We know that "Part of golf club" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case part of golf club = hosel.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 HOSEL mean?
HOSEL noun- The portion of the head of a golf club to which the shaft of the club attaches.
- (slang) A semester, in the context of a course of study which should be enjoyable as opposed to required work.