The most common and most likely answer to this crossword clue is the 7 letter word ARANEID
A
R
A
N
E
I
D
Buddy explains!
The straight part
We know that "Spider" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case spider = araneid.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 ARANEID mean?
ARANEID noun- A spider; now specifically a member of the family Araneidae; an orb weaver.