Crossword Genius

Yes, sir, Cath's misbehaving with tongue, sticking it out (7,3,6)

Ross

I believe the answer is:

staying the course

I'm a little stuck... Click here to teach me more about this clue!

'yes sir cath's misbehaving with tongue' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'sticking it out' is the wordplay.
I cannot quite understand how this works, but
'sticking' could be 'staying' ('stay' can be a synonym of 'stick') and 'staying' is found in the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is located in the answer.
This explanation may well be incorrect...

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