Very good month, say, to import fine item of account (9)
I believe the answer is:
something
'item of account' is the definition.
'something' can be an answer for 'item' (I have seen 'Unspecified item ' mean 'something' so perhaps 'item' could also mean 'something'). I am not sure about the 'of account' bit.
'very good month say to import fine' is the wordplay.
'very good' becomes 'so' (as in the adjectival form 'just so!').
'month' becomes 'm' (standard abbreviation).
'say' becomes 'eg'.
'to import' is an insertion indicator.
'fine' becomes 'thin' (similar in meaning).
'eg' going around 'thin' is 'ething'.
'so'+'m'+'ething'='SOMETHING'
Can you help me to learn more?
(Other definitions for something that I've seen before include "It's not nothing" , "unknown" , "Unspecified item" , "Special quality" .)