The most common and most likely answer to this crossword clue is the 7 letter word SHELLAC
S
H
E
L
L
A
C
More clues leading to the result SHELLAC
- Contacts from East cut by ambassador
- Ambassador involved in appeals about matter of record?
- Gloss given by oil company account
- Varnish covering jacket of almanac
- Female put on ring turned over in varnish
- Inside container, fire down below producing resin
- Oil company gets bill for resin
- Varnish explosive account
- He rings up about old record
- Sticky stuff gives nasty experience in body cavity
Buddy explains!

The straight part
We know that "material in many early rock’n’roll records" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case material in many early rock’n’roll records = shellac.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SHELLAC mean?
SHELLAC noun- A processed secretion of the lac insect, Coccus lacca; used in polishes, varnishes etc.
- A beating; a thrashing.
- To coat with shellac.
- To beat; to thrash.
- To inflict a heavy defeat upon.