Acting lesson gives slightly thrilling sensation (6)
I believe the answer is:
tingle
'thrilling sensation' is the definition.
(I've seen this before)
'acting lesson gives' is the wordplay.
'gives' indicates a hidden word.
'TINGLE' can be found hidden inside 'acting lesson'.
'slightly' is the link.
This may not be correct. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for tingle that I've seen before include "Prickling or slightly stinging sensation" , "Slight prickling sensation" , "Shiver down the spine?" , "Stinging or thrilling sensation" , "Feel slight stinging sensation" .)