Cryptic crossword clue
Lump on the head, or wing? Not positive at first 5

The most common and most likely answer to this crossword clue is the 5 letter word INION

I
N
I
O
N

Buddy explains!

The straight part
We know that "Lump on the head" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lump on the head = inion.
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 INION mean?

INION noun
  1. A small protuberance on the external surface of the back of the skull near the neck; the external occipital protuberance.

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