What the toucan did was adequate (6,3,4)
I believe the answer is:
filled the bill
'adequate' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'what the toucan did' is the wordplay.
I cannot quite see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
'did' could be 'led' (leading is a kind of doing) and 'led' is found within the answer.
This explanation may well be incorrect...
'was' acts as a link.
Can you help me to learn more?
(Other definitions for filled the bill that I've seen before include "Suited a particular purpose" , "Served - performed adequately" .)