Let out to catch bug (6)
I believe the answer is:
nettle
'bug' is the definition.
(I've seen this before)
'let out to catch' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'to' means one lot of letters go next to another (I've seen this in other clues).
'catch' becomes 'net' (netting is a kind of catching).
'let' with letters rearranged gives 'tle'.
'tle' put after 'net' is 'NETTLE'.
(Other definitions for nettle that I've seen before include "sample of herbal tea?" , "Bug" , "Clasp it firmly and it will not sting" , "Plant with stinging hairs" , "Grasp it firmly and it will not sting" .)