Spanish gentleman concealed goal stupidly (7)
I believe the answer is:
hidalgo
'spanish gentleman' is the definition.
(I've seen this before)
'concealed goal stupidly' is the wordplay.
'concealed' becomes 'hid' ('hide' can be a synonym of 'conceal').
'stupidly' indicates anagramming the letters.
'goal' anagrammed gives 'algo'.
'hid'+'algo'='HIDALGO'
(Other definitions for hidalgo that I've seen before include "foreign gentleman" , "Spanish nobleman" , "Spanish aristocrat" , "Pachuca is capital of this Mexican state" , "Grandee" .)