Reckon to have one million in assets (8)
I believe the answer is:
estimate
'reckon' is the definition.
(synonyms)
'one million in assets' is the wordplay.
'one million' becomes 'im' (resembles 1m, 1 million).
'in' means one lot of letters goes inside another.
'assets' becomes 'estate' (I've seen this in another clue).
'im' inserted inside 'estate' is 'ESTIMATE'.
'to have' is the link.
(Other definitions for estimate that I've seen before include "Tease Tim (anag.)" , "approximate price" , "Make approximate judgement of size or amount" , "Reckon value" , "Reckon, judge" .)