Regiment to invite a new recruit (9)
I believe the answer is:
novitiate
'recruit' is the definition.
(thesaurus)
'regiment to invite a new' is the wordplay.
'to invite a' anagrams to 'NOVITIATE'.
However, I am not sure how this is indicated.
Can you help me to learn more?
(Other definitions for novitiate that I've seen before include "newcomer in convent" , "Period in religious life before final vows are taken" , "New church member" , "New convert" .)