Prepare no trap for big fish (6)
I believe the answer is:
tarpon
'big fish' is the definition.
'tarpon' can be an answer for 'fish' (I've seen this before). I am not sure about the 'big' bit.
'prepare no trap' is the wordplay.
'prepare' indicates an anagram.
'no'+'trap'='notrap'
'notrap' anagrammed gives 'TARPON'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for tarpon that I've seen before include "Great fish of Florida" , "Large silvery game fish of coastal waters off Florida" , "No part for this large fish" .)