Hardly a barley product (6)
I believe the answer is:
barely
'hardly' is the definition.
('barely' can be a synonym of 'hardly')
'a barley product' is the wordplay.
'barley' anagrams to 'BARELY'.
However, I'm not clear how the anagram is indicated.
Can you help me to learn more?
(Other definitions for barely that I've seen before include "Just about or scantily" , "Not quite" , "Hardly" , "just a short while before" , "how naturists exist" .)