The wordplay as Gregsdad says, leads to ORCA
ORCHA(t)= finally got away from old enclosed fruit garden, with H as the extra letter.
There is a slip-up in the definition "Tolkien's ogre" which is ORC not ORCA - a killer whale.
Yes, think it's a mistake. I'm no expert, or indeed fan, of Tolkien so don't know whether ORC was referred to as ORCA at all in his books ? Looking up the derivation of the word ORCA only served to muddy the waters.
I was about to answer you when I saw Slaney also thought there was a setter mistake. Interesting! I've finished everything apart from 18d. Any help to tidy this away would be much appreciated.
I just took the connection to be the title of the puzzle: 'Baby Talk'.
Both quotes relate to babies.
But I wouldn't be surprised if there is a deeper and more subtle connection - which someone will post, I'm sure.