First male worker showing stubborn determination (7)

I believe the answer is:

adamant

'showing stubborn determination' is the definition.

'first male worker' is the wordplay.
'first male' becomes 'adam'.
'worker' becomes 'ant' (worker is a type of ant).
'adam'+'ant'='ADAMANT'

(Other definitions for adamant that I've seen before include "Unswerving" , "Legendary rock" , "Refusing to change opinion" , "popstar" , "Inexorable" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.