Grey ale brewed with enthusiasm (7)
I believe the answer is:
eagerly
'with enthusiasm' is the definition.
(I've seen this before)
'grey ale brewed' is the wordplay.
'brewed' is an anagram indicator.
'grey'+'ale'='greyale'
'greyale' is an anagram of 'EAGERLY'.
(Other definitions for eagerly that I've seen before include "In a keen manner" , "Showing impatience" , "With enthusiasm" , "With keen anticipation" , "Ardently and avidly" .)