A lot of shops brought back source of wool (5)
I believe the answer is:
llama
'source of wool' is the definition.
(I've seen this in another clue)
'a lot of shops brought back' is the wordplay.
'lot of shops' becomes 'mall' (a large shopping centre).
'brought back' shows that the letters should be reversed in order.
'a'+'mall'='amall'
'amall' in reverse letter order is 'LLAMA'.
(Other definitions for llama that I've seen before include "Long-necked woolly animal" , "One bearing burden" , "S American animal related to the camel" , "Peruvian transportation" , "South American animal like the camel" .)