Mix as zany lassie, one with company around being entertained (9)
I believe the answer is:
socialise
'mix' is the definition.
('mix'->'socialize' is in my internal thesaurus and 'ize'->'ise')
'as zany lassie one with company around being entertained' is the wordplay.
I cannot quite understand how this works, but
'as' could be 'so' (I've seen this in other clues) and 'so' is found within the answer.
'lassie' could be 'lise' and 'lise' is present in the answer.
'one' could be 'i' (roman numeral) and 'i' is found in the answer.
'around' could be 'ca' (circa) and 'ca' is present in the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for socialise that I've seen is " mingle".)