The most common and most likely answer to this crossword clue is the 7 letter word GLINTED
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More clues leading to the result GLINTED
Buddy explains!

The straight part
We know that "Gave off flashes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case gave off flashes = glinted.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 GLINTED mean?
GLINTED verb- To flash or gleam briefly.
- To glance; to peep forth, as a flower from the bud; to glitter.
- To cause to flash or gleam; to reflect.
- To dry; to wither.