Gluttonous? Gorge, feed? Aye, regularly (6)
I believe the answer is:
greedy
'gluttonous?' is the definition.
('greedy' can be similar in meaning to 'gluttonous')
'gorge feed? aye regularly' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'gorge'+'feed'+'aye'='gorgefeedaye'
The alternate letters of 'gorgefeedaye' are 'GREEDY'.
(Other definitions for greedy that I've seen before include "Grasping" , "Keen" , "Gluttonous" , "Wanting too much" , "Having eyes bigger than stomach!" .)