Unable to choose actor needing part (4)
I believe the answer is:
torn
'unable to choose' is the definition.
(I've seen this in another clue)
'actor needing part' is the wordplay.
'part' indicates the answer is hidden within the clue.
'TORN' is hidden in the letters of 'actor needing'.
(Other definitions for torn that I've seen before include "In a state of uncertainty between two conflicting options" , "Undecided between two" , "Dance wear" , "Lacerated - in two minds" , "Removed forcibly" .)