Foreign gentleman concealed strange goal (7)
I believe the answer is:
hidalgo
'foreign gentleman' is the definition.
(I've seen this before)
'concealed strange goal' is the wordplay.
'concealed' becomes 'hid' ('hide' can be a synonym of 'conceal').
'strange' indicates an anagram.
'goal' is an anagram of 'algo'.
'hid'+'algo'='HIDALGO'
(Other definitions for hidalgo that I've seen before include "Grandee" , "Spanish fellow" , "Spanish gentleman" , "foreign gentleman" , "Spanish nobleman" .)