Let the cat out of the bag (4)
![Ross](/clue/static/ross-mug.min.png)
'let the cat out of the bag' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for blab that I've seen before include "Tell tales" , "Tells tales" , "Let the cat out of the bag" , "Let slip" , "Spill the beans" .)
(Other definitions for disclose that I've seen before include "Betray" , "Make (secret) known" , "Sold ices (anag)" , "Divulge, reveal" , "broadcast" .)