Part of body seen by the Spanish officer (7)
I believe the answer is:
colonel
'officer' is the definition.
(colonel is a kind of officer)
'part of body seen by the spanish' is the wordplay.
'part of body' becomes 'colon' (I've seen this before).
'seen by' is a charade indicator (letters next to each other).
'the spanish' becomes 'el' ('the' in Spanish).
'colon'+'el'='COLONEL'
(Other definitions for colonel that I've seen before include "Military rank" , "No cello (anag.)" , "High-ranking officer" , "Comissioned military officer" , "Army rank" .)