Cryptic crossword clue
Reacting from chemistry: one courting with hug and kiss at the start 9

The most common and most likely answer to this crossword clue is the 9 letter word OXIDATING

I've seen this crossword clue in The Guardian
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The straight part
We know that "Reacting from chemistry" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case reacting from chemistry = oxidating.
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 OXIDATING mean?

OXIDATING verb
  1. To oxidize.

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