Individual new to the Spanish staff (9)
I believe the answer is:
personnel
'staff' is the definition.
(I've seen this before)
'individual new to the spanish' is the wordplay.
'individual' becomes 'person' (synonyms).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'to the spanish' becomes 'el' ('the' in Spanish).
'person'+'n'+'el'='PERSONNEL'
(Other definitions for personnel that I've seen before include "Manpower" , "Members of staff" , "Staff complement of an organisation" , "Crew" , "Employees collectively" .)