Enigmatic Variations 1595 - Barred Off By Chalicea

[Matakari]

Good evening, a nice little novelty of juggling letters from our own Chalicea. Enjoyed a few so far but am stuck on the following for which I would appreciate your help. Thanks in advance!

( In one answer in each column the direction and wordplay give a pair of words differing by one letter. The shorter word must be entered in the main grid and the unused letter must be put in the BARRED-OFF area. The wordplay in all the other clues leads to an extra letter that is not required by the answer. These, read in clue order, will tell you what you have done when you have completed the puzzle. )

13a Utter sharp little cries as leaders of youths in choir knowingly make a mistake (6) Y?????
14a Life stories ( rejecting the not exactly fit) sorted out without any resentment ( 7 ) I??L??? ( IRELESS)
16a Development of pest greater in tropical fruit producers ( 10 ) G?A???????
33a Animal park debacle from time to time about creatures’ larval stage ( 5 ) ?OE?L ( ZOEAL )

3d One operating flat boat contrived feat on river ( 5 ) AF???
17d Siberian cedar in area including holly with bark stripped ( 6 ) ?ROLL? ( AROLLA )
18d Not at first beau, good hard wood for the Bard (4 ) ??GH

[Neveracrossword]

Glad we helped you finish this one off, Matakari. Yes,the other extra letters weren't at all crucial - but fine for confirmation.