The most common and most likely answer to this crossword clue is the 6 letter word ANGLER
I've seen this crossword clue in The Times
A
N
G
L
E
R
More clues leading to the result ANGLER
- Strong feeling about large person fastening flies?
- Fisherman’s view beside river
- One dropping a line to get hold of Sturgeon?
- Fisherman in corner on right
- Visitor to bank, perhaps, left in indignation
- View back of sinister man adjusting flies?
- One maybe wants bass note to fill large complex
- One fishing in lake consumed by exasperation
- One casting movie director’s unfinished Romeo
- One patiently sitting at the riverside left in rage
Buddy explains!

The straight part
We know that "person fastening flies" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case person fastening flies = angler.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 ANGLER mean?
ANGLER noun- A person who fishes with a hook and line.
- An angler fish, Lophius piscatorius.
- Someone who tries to work an angle; a person who schemes or has an ulterior motive.
- (thieves' cant) A thief who uses a hooked stick to steal goods out of shop-windows, grates, etc.