Crossword puzzle clue "oily buildup that's been around a long time"

Here are the possible solutions for oily buildup that's been around a long time clue

Answer
Clue
Relevancy
ancientgrease
Clue
Oily buildup that's been around a long time?
eon
Clue
Long long long long long long long time
Long, long, long time
Definition
a long period of time, also AEON
iroam
Clue
"___ around around around around" (repeated line in Dion and the Belmonts' "The Wanderer")
"___ around around around around" (lyric from Dion and the Belmonts' "The Wanderer")
paleo
Clue
Diet that's been around a long time?
its
Clue
"___ Been a Long, Long Time"
Definition
possessive form of IT
delta
Clue
Buildup around the mouth
Definition
an alluvial deposit at the mouth of a river

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