Chuck, it seems, is of doubtful worth! (5)
I believe the answer is:
throw
'chuck' is the definition.
(I know that chuck is a more specific form of the action the throw)
'doubtful worth' is the wordplay.
'doubtful' indicates anagramming the letters.
'worth' is an anagram of 'THROW'.
'it seems is of' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for throw that I've seen before include "Light rug" , "puzzle" , "pitch or > floor" , "Try not to win" , "lose on purpose" .)