A lake to peg float, entrapping bright salmon? (5,4)

'entrapping bright salmon?' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'a lake to peg float' is the wordplay.
I cannot really understand how this works, but
'a' is within the answer.
'lake' could be 'l' (geographical abbreviation) and 'l' is found within the answer.
'peg' could be 'pin' (synonyms) and 'pin' is found in the answer.
'float' could be 'cork' (cork is a kind of float) and 'cork' is located in the remaining letters.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?