Enjoyed having delved (3)
I believe the answer is:
dug
I believe this is a double definition.
'enjoyed' is the first definition.
(slang)
'delved' is the second definition.
('dig' can be a synonym of 'delve')
'having' acts as a link.
(Other definitions for dug that I've seen before include "Appreciated" , "Udder or teat" , "Excavated" , "Used a spade" , "Delved; teat" .)