Spanish nobleman concealed a large repair (7)
I believe the answer is:
hidalgo
'spanish nobleman' is the definition.
(I've seen this in another clue)
'concealed a large repair' is the wordplay.
'concealed' becomes 'hid' ('hide' can be a synonym of 'conceal').
'large' becomes 'lg' (abbreviation).
'repair' becomes 'o' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'hid'+'a'+'lg'+'o'='HIDALGO'
Can you help me to learn more?
(Other definitions for hidalgo that I've seen before include "Grandee" , "Spanish nobleman" , "foreign gentleman" , "Spanish gentleman" , "Spanish fellow" .)