Crossword Genius

First male worker is resolute (7)

Ross

I believe the answer is:

adamant

'resolute' is the definition.
(both can mean determined)

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

'is' is the link.

(Other definitions for adamant that I've seen before include "Hard stone" , "Insistent, inflexible" , "6a [PRINCESS IDA] 's fortress < for unyielding" , "Definite and unyielding" , "Determined and unyielding to requests" .)

I've seen this clue in The Globe and Mail and The Telegraph.
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