Trim tail off wader (4)
I believe the answer is:
snip
'trim' is the definition.
(I know that trim can be written as snip)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for snip that I've seen before include "Bargain (informal)" , "Cut - certainty" , "Cut with shears" , "Bargain (coll)" , "Something cheap or easy to do" .)