Fed outside shelter, an old minstrel (7)
I believe the answer is:
gleeman
'old minstrel' is the definition.
'gleeman' can be an answer for 'minstrel' (thesaurus). I am unsure of the 'old' bit.
'fed outside shelter' is the wordplay.
'fed' becomes 'G-man' (both can mean a US federal agent).
'outside' means one lot of letters goes inside another (some letters go outside others).
'shelter' becomes 'lee' (as in lee side, the side sheltered from wind).
'gman' enclosing 'lee' is 'GLEEMAN'.
'an' is the link.
Can you help me to learn more?
(Other definitions for gleeman that I've seen before include "Bard" , "one singing songs" .)