In pool, stroke inside of arm as sensitive (5)
I believe the answer is:
masse
'in pool' is the definition.
(I know that masse is part of pocket billiards)
'of arm as sensitive' is the wordplay.
'of' says the answer is hidden in the clue.
'MASSE' is hidden within 'arm as sensitive'.
'stroke inside' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for masse that I've seen before include "'En ..., all together (5)'" , "Swerving snooker stroke" , "Swerve shot at billiards" .)