Encourage Tati move that's funny (8)
I believe the answer is:
motivate
'encourage' is the definition.
(thesaurus)
'tati move that's funny' is the wordplay.
'that's funny' is an anagram indicator.
'tati'+'move'='tatimove'
'tatimove' with letters rearranged gives 'MOTIVATE'.
(Other definitions for motivate that I've seen before include "Stimulate to action" , "Induce" , "Give an incentive for action" , "Stimulate the interest of" , "Drive on" .)