First male worker is determined not to give way (7)
I believe the answer is:
adamant
'determined not to give way' is the definition.
I can't tell whether this defines the answer.
'first male worker' is the wordplay.
'first male' becomes 'adam' (first man in the Bible).
'worker' becomes 'ant' (worker is a type of ant).
'adam'+'ant'='ADAMANT'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for adamant that I've seen before include "Data man can be quite unyielding" , "Unpersuadable" , "Refusing to budge" , "intractable" , "Hard stone" .)