Join admitting one is mercenary? (7)
I believe the answer is:
soldier
'mercenary?' is the definition.
(I know that Soldier has the occupation mercenary)
'join admitting one' is the wordplay.
I cannot quite see how this works, but
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
'join' could be 'solder' (soldering is a kind of joining) and 'solder' is located in the leftover letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'is' acts as a link.
Can you help me to learn more?
(Other definitions for soldier that I've seen before include "One enlisted" , "Person serving in army" , "serviceman" , "Member of the military" , "Military man" .)