Forget about that bird trapped among bricks! (3,2,2)
I believe the answer is:
let it go
'forget' is the definition.
(thesaurus)
'that bird trapped among bricks' is the wordplay.
I cannot really see how this works, but
'bird' could be 'tit' (tit is a kind of bird) and 'tit' is found within the answer.
'bricks' could be 'lego' (plastic brick toys) and 'lego' is located in the remaining letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'about' acts as a link.
Can you help me to learn more?
(Other definitions for let it go that I've seen before include "Disney tune" , "Hit song from Disney's 2013 animated feature film Frozen" , "Excuse something" , "Refrain from comment" .)