The most common and most likely answer to this crossword clue is the 5 letter word BOXER
B
O
X
E
R
More clues leading to the result BOXER
- Dog beginning to bark at high fence
- Fighter backing king of Britain at outset
- Source of howl, bark and jabber
- Dog, oriental one hostile to foreigners, revolting?
- Way of describing crater? Rocky, say
- Lightweight worker in goods packing?
- Underwear rebellion?
- Dog may have a second helping
- 16 with shorts
- One picks up purse after fighting dog
Buddy explains!

The straight part
We know that "one seeking striking effect" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one seeking striking effect = boxer.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 BOXER mean?
BOXER noun- A participant (fighter) in a boxing match.
- A breed of stocky, medium-sized, short-haired dog with a square-jawed muzzle.
- A type of internal combustion engine in which cylinders are arranged in two banks on either side of a single crankshaft.
- The person running a game of two-up.
- One who packs boxes.
- A letterboxer.