Little creature in rags upset one making purchases (11)
I believe the answer is:
grasshopper
'little creature' is the definition.
'grasshopper' can be an answer for 'creature' (grasshopper is a kind of animal). I'm not sure about the 'little' bit.
'rags upset one making purchases' is the wordplay.
'upset' indicates anagramming the letters.
'one making purchases' becomes 'shopper' (I've seen this before).
'rags' is an anagram of 'gras'.
'gras'+'shopper'='GRASSHOPPER'
'in' is the link.
Can you help me to learn more?
(Other definitions for grasshopper that I've seen before include "Insect (that won't stay still for long?)" , "Jumping insect" , "Type of cricket" , "Excellent jumper" , "small jumper" .)