The most common and most likely answer to this crossword clue is the 6 letter word RELICT
R
E
L
I
C
T
More clues leading to the result RELICT
- Survivor fired up again about beginning of challenge
- Remnant, keepsake close to heart
- Journalist on the up leaving ramshackle reminder of a bygone era
- Widow caught with priest after introduction to religion
- Widow going again to collect first of children
- Widow got old flame going keeping cool at first
- On insurer's final settlement to widow
- Left in a trice, turned out to be very old
Buddy explains!

The straight part
We know that "Remnant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case remnant = relict.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 RELICT mean?
RELICT noun- Something that, or someone who, survives or remains or is left over after the loss of others; a relic.
- Surviving, remaining.
- That is a relict; pertaining to a relict.