He strikes one as a forcing bat (6)
I believe the answer is:
hitter
'he strikes one as a forcing' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'bat' is the wordplay.
I cannot really understand how this works, but
'bat' could be 'hit' (I've seen this in another clue) and 'hit' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for hitter that I've seen is " Boxer with a hard punch".)