Shop around for beer ingredient (4)
I believe the answer is:
hops
'beer ingredient' is the definition.
(I've seen this before)
'shop around' is the wordplay.
'around' indicates anagramming the letters.
'shop' with letters rearranged gives 'HOPS'.
'for' acts as a link.
(Other definitions for hops that I've seen before include "what could make you bitter" , "Skips" , "Dances -- beer ingredient" , "Leaps on one leg" , "(Little) jumps" .)