The most common and most likely answer to this crossword clue is the 7 letter word WIZENED
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Buddy explains!
The straight part
We know that "showing lots of old lines" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case showing lots of old lines = wizened.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 WIZENED mean?
WIZENED verb- To wither; to become, or make, lean and wrinkled by shrinkage, as from age or illness.
- Withered; lean and wrinkled by shrinkage as from age or illness.