Natural ability held back by dictatorial fellow (5)
I believe the answer is:
flair
'natural ability' is the definition.
(flair is a kind of natural ability)
'held back by dictatorial fellow' is the wordplay.
'back by' is a reversal indicator.
'held' indicates a hidden word.
'rialf' is hidden within 'dictatorial fellow'.
'rialf' reversed gives 'FLAIR'.
(Other definitions for flair that I've seen before include "Natural talent or panache" , "Taste" , "Style, talent" , "Natural talent and aptitude" , "gift" .)