It's sure a tricky feat! (4)
I believe the answer is:
fate
'it's sure a' is the definition.
I can't tell whether this defines the answer.
'tricky feat' is the wordplay.
'tricky' indicates anagramming the letters.
'feat' is an anagram of 'FATE'.
Can you help me to learn more?
(Other definitions for fate that I've seen before include "Predetermined end" , "One's lot" , "Predestiny" , "What must be" , "Clotho, Lachesis or Atropos" .)