Extraordinary chaps putting a learner off, for example (8)
I believe the answer is:
specimen
'example' is the definition.
(I know that example can be written as specimen)
'extraordinary chaps putting a learner off' is the wordplay.
I cannot really see how this works, but
'chaps' could be 'men' (chap means a man) and 'men' is found within the answer.
This may be the basis of clue (or it may be nonsense).
'for' is the link.
(Other definitions for specimen that I've seen before include "Typical example - sample" , "Example for the collector or scientist" , "Person critically" , "Example of type" , "Something used as an example" .)