Assess the condition I'm in (8)
I believe the answer is:
estimate
'assess' is the definition.
(I've seen this before)
'condition i'm in' is the wordplay.
'condition' becomes 'estate' (I've seen this before).
'in' indicates putting letters inside.
'estate' enclosing 'im' is 'ESTIMATE'.
'the' acts as a link.
(Other definitions for estimate that I've seen before include "Statement giving the likely cost of a job" , "Tease Tim (anag.)" , "Calculate approximately" , "Calculate in approximate way" , "Judge the worth of" .)