Leggy bird from Old Street loaded (7)
I believe the answer is:
ostrich
'leggy bird' is the definition.
'ostrich' can be an answer for 'bird' (ostrich is a kind of bird). I'm not sure about the 'leggy' bit.
'old street loaded' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'street' becomes 'st' (abbreviation).
'loaded' becomes 'rich' (similar in meaning).
'o'+'st'+'rich'='OSTRICH'
'from' is the link.
Can you help me to learn more?
(Other definitions for ostrich that I've seen before include "A bird for the shirt co." , "one tries to hide in the sand" , "Creature" , "Emu-like bird" , "World's largest bird" .)