Police officers right to go into data on titled ladies (9)
I believe the answer is:
gendarmes
'police officers' is the definition.
(gendarme is a kind of police officer)
'right to go into data on titled ladies' is the wordplay.
'right' becomes 'r' (common abbreviation).
'to go into' means one lot of letters goes inside another (some letters go into others).
'data' becomes 'gen' (I've seen this in other clues).
'on' means one lot of letters go next to another.
'titled ladies' becomes 'dames' (I've seen this in another clue).
'gen'+'dames'='gendames'
'r' placed within 'gendames' is 'GENDARMES'.
(Other definitions for gendarmes that I've seen before include "soldiers" , "French policemen" .)