The most common and most likely answer to this crossword clue is the 7 letter word ADAMANT
I've seen this crossword clue in Financial Times
A
D
A
M
A
N
T
More clues leading to the result ADAMANT
- Determined Armada man took ships
- Insistent a worker must shore up barrier
- Hard worker supporting architect
- Stiff singer usually seen dressed up
- First male worker, stubbornly resolute
- Tough barrier that a soldier goes over
- Determined to be a worker on embankment
- Biblical beast in terms of Apocrypha that’s inexorable
- First husband has terrible tan fixed
- . Determined now to get Mum set up with social worker
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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 ADAMANT mean?
ADAMANT noun- An imaginary rock or mineral of impenetrable hardness; a name given to the diamond and other substances of extreme hardness.
- An embodiment of impregnable hardness.
- A lodestone.
- (said of people and their conviction) Firm; unshakeable; unyielding; determined.
- (of an object) Very difficult to break, pierce, or cut.