Terrible Barnaby's maladjusted to some extent (7)

I believe the answer is:

abysmal

'terrible' is the definition.
(I've seen this before)

'barnaby's maladjusted to some extent' is the wordplay.
'to some extent' indicates the answer is hidden within the clue.
'ABYSMAL' is hidden in the letters of 'barnabys maladjusted'.

(Other definitions for abysmal that I've seen before include "Appallingly bad" , "Very deep or bad" , "Very deeply bad" , "Dreadful" , "awful" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.