Mean finish follows one no trumps (6)
I believe the answer is:
intend
'mean' is the definition.
('intend' can be a synonym of 'mean')
'finish follows one no trumps' is the wordplay.
'finish' becomes 'end' ('end' can be a synonym of 'finish').
'follows' says to put letters next to each other.
'one' becomes 'i' (Roman numeral).
'no trumps' becomes 'nt'.
'i'+'nt'='int'
'end' after 'int' is 'INTEND'.
(Other definitions for intend that I've seen before include "Mean - purpose" , "Signify" , "Aim, plan" , "Have as purpose or in mind" , "Mean; aim" .)