The most common and most likely answer to this crossword clue is the 5 letter word CATCH
I've seen this crossword clue in The Times
C
A
T
C
H
Buddy explains!

The straight part
We know that "Trap" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case trap = catch.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 CATCH mean?
CATCH noun- The act of seizing or capturing.
- The act of catching an object in motion, especially a ball.
- The act of noticing, understanding or hearing.
- The game of catching a ball.
- Something which is captured or caught.
- (by extension) A find, in particular a boyfriend or girlfriend or prospective spouse.
- A stopping mechanism, especially a clasp which stops something from opening.
- A hesitation in voice, caused by strong emotion.
- (sometimes noun adjunct) A concealed difficulty, especially in a deal or negotiation.
- A crick; a sudden muscle pain during unaccustomed positioning when the muscle is in use.
- A fragment of music or poetry.
- A state of readiness to capture or seize; an ambush.
- A crop which has germinated and begun to grow.
- A type of strong boat, usually having two masts; a ketch.
- A type of humorous round in which the voices gradually catch up with one another; usually sung by men and often having bawdy lyrics.
- The refrain; a line or lines of a song which are repeated from verse to verse.
- The act of catching a hit ball before it reaches the ground, resulting in an out.
- A player in respect of his catching ability; particularly one who catches well.
- The first contact of an oar with the water.
- A stoppage of breath, resembling a slight cough.
- Passing opportunities seized; snatches.
- A slight remembrance; a trace.
- (heading) To capture, overtake.
- (heading) To seize hold of.
- (heading) To intercept.
- (heading) To receive (by being in the way).
- (heading) To take in with one's senses or intellect.
- (heading) To seize attention, interest.
- (heading) To obtain or experience