Bring into force (6)
I believe the answer is:
enlist
This could be a double definition.
'bring' is the first definition.
(thesaurus)
'force' is the second definition.
Although both the answer and definition are verbs in their base form, I cannot see how one could define the other.
'into' is the link.
Can you help me to learn more?
(Other definitions for enlist that I've seen before include "Listen (anag.)" , "Draft" , "Join the armed forces" , "Take the Queen's shilling" , "Join the military" .)