Choose twelve people from a number in force (7)
I believe the answer is:
impanel
'choose twelve people' is the definition.
'impanel' can be an answer for 'choose' (impaneling is a kind of choosing). I am not sure about the 'twelve people' bit.
'a number in force' is the wordplay.
'number' becomes 'n' (n can represent any number).
'in' indicates putting letters inside.
'force' becomes 'impel' (synonyms).
'a'+'n'='an'
'an' inserted inside 'impel' is 'IMPANEL'.
'from' acts as a link.
Can you help me to learn more?
(Other definitions for impanel that I've seen before include "recruit to jury" , "Make judges" .)