Probably parrot will shear mass of tissue up (4,2,3)
I believe the answer is:
like as not
'probably' is the definition.
(I've seen this before)
'parrot will shear mass of tissue up' is the wordplay.
I cannot quite see how this works, but
'parrot' could be 'kea' (kea is a kind of parrot) and 'kea' is found in the answer.
'of' could be 'o' and 'o' is found within the answer.
'up' could be 'is' (I've seen this in other clues) and 'is' is located in the leftover letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for like as not that I've seen is " probably".)