The most common and most likely answer to this crossword clue is the 6 plus 6 letter word SINGLE MINDED
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Buddy explains!
The straight part
We know that "Intent/not marrying" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case intent/not marrying = single minded.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 SINGLE MINDED mean?
SINGLE MINDED adjective- Intensely focused and concentrated on purpose, thinking of only one goal, undistractable.