Cryptic crossword clue
Henry has information about oxygen and iodine, perhaps 7

The most common and most likely answer to this crossword clue is the 7 letter word HALOGEN

I've seen this crossword clue in The Daily Telegraph
H
A
L
O
G
E
N


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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 HALOGEN mean?

HALOGEN noun
  1. Any element of group 17, i.e. fluorine, chlorine, bromine, iodine and astatine, which form a salt by direct union with a metal.
  2. A light fixture in which the filament is surrounded by an atmosphere of a halogen gas,

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