Insect with large rear pincers (6)
I believe the answer is:
earwig
'insect with large rear pincers' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for earwig that I've seen before include "Common garden insect" , "Go in for eavesdropping" , "Insect with pincer-like tail" , "Insect with antennae and pincers" , "Fork-tailed insect" .)