Spanish yes man in Jamaica, he says (5)
I believe the answer is:
simon
'he says' is the definition.
(I've seen this in another clue)
'spanish yes man in jamaica' is the wordplay.
'spanish yes' becomes 'si' (Yes in Spanish).
'man in jamaica' becomes 'mon' (I am not sure about this - if you are sure you should believe this answer much more).
'si'+'mon'='SIMON'
Can you help me to learn more?
(Other definitions for simon that I've seen before include "One of Christ's apostles" , "Simple pieman" , "Man's name" , "- Bol'var, S. American liberator" , "Bolivar, de Montfort, Callow or Cowell?" .)