Times incorrectly claiming Hendry's back in snooker (6)
I believe the answer is:
stymie
'snooker' is the definition.
(both can mean to frustrate or hinder)
'times incorrectly claiming hendry's back' is the wordplay.
'incorrectly' indicates an anagram (I've seen this in other clues).
'claiming' is an insertion indicator.
'back' says to take the final letters (the letter at the back).
The last letter of 'hendry' is 'y'.
'times' with letters rearranged gives 'stmie'.
'stmie' placed around 'y' is 'STYMIE'.
'in' acts as a link.
(Other definitions for stymie that I've seen before include "Thwart (as once was possible on the green)" , "'Hinder, obstruct (6)'" , "Snooker" , "Frustrate" , "Thwart - block - my site (anag)" .)