Act unrestrainedly on cycle three times (6)
I believe the answer is:
triple
'three times' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for triple that I've seen before include "Consisting of three" , "Threefold, treble" , "make score sixty?" , "In three parts" , "Increase threefold" .)