Secret spot, with trap (4-3-6)
I believe the answer is:
hole-and-corner
'secret' is the definition.
(I know that secret can be written as hole-and-corner)
'spot with trap' is the wordplay.
I cannot quite understand how this works, but
'spot' could be 'corner' (corner is a kind of spot) and 'corner' is found in the answer.
'with' could be 'and' and 'and' is located in the answer.
'trap' could be 'hole' (synonyms) and 'hole' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for hole-and-corner that I've seen before include "Underhand" , "Surreptitious" , "Secretive" .)