Fish hook used by the Spanish (6)
I believe the answer is:
barbel
'fish' is the definition.
(I know that Barbel is a type of fish)
'hook used by the spanish' is the wordplay.
'hook' becomes 'barb' (I've seen this before).
'used by' is a charade indicator (letters next to each other).
'the spanish' becomes 'el' ('the' in Spanish).
'barb'+'el'='BARBEL'
(Other definitions for barbel that I've seen before include "swimmer" , "catfish feature" , "fish" .)