Hallucinate the foamings and bubblings (3,6)
I believe the answer is:
see things
'hallucinate' is the definition.
(I've seen this before)
'the foamings and bubblings' is the wordplay.
I cannot really understand how this works, but
an anagram of 'the' is 'eth' which is within the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for see things that I've seen is " Hallucinate".)