Very enthusiastic Greek god gets a look in (7)
I believe the answer is:
zealous
'very enthusiastic' is the definition.
(I've seen this before)
'greek god gets a look in' is the wordplay.
'greek god' becomes 'zeus' (Zeus is an example**).
'gets' indicates putting letters inside (gets can mean captures or absorbs).
'look' becomes 'lo'.
'in' is an insertion indicator.
'zeus' enclosing 'a' is 'zeaus'.
'zeaus' enclosing 'lo' is 'ZEALOUS'.
(Other definitions for zealous that I've seen before include "Showing great energy and enthusiasm" , "Ardently active" , "Avidly enthusiastic" , "Highly enthusiastic" , "Ardent - devoted" .)