Hero of the Spanish police department (2,3)
I believe the answer is:
el cid
'hero' is the definition.
(I've seen this before)
'the spanish police department' is the wordplay.
'the spanish' becomes 'el' ('the' in Spanish).
'police department' becomes 'CID' (abbreviation for Criminal Investigation Department).
'el'+'cid'='EL CID'
'of' is the link.
(Other definitions for el cid that I've seen before include "Role of Charlton" , "Historic fighter" , "Eleventh Century Spanish hero" , "Ruy Diaz starts" , "epic movie" .)