Cryptic crossword clue
A cause of abnormal growth, some reason cogently 7

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

I've seen this crossword clue in Independent
O
N
C
O
G
E
N

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The straight part
We know that "A cause of abnormal growth" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a cause of abnormal growth = oncogen.
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.

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