One no trump concluded as planned (8)
I believe the answer is:
intended
'planned' is the definition.
(intending is a kind of planning)
'one no trump concluded' is the wordplay.
'one' becomes 'i' (Roman numeral).
'no trump' becomes 'nt' (abbreviation used in card games such as bridge).
'concluded' becomes 'ended' ('ended' can be a synonym of 'concluded').
'i'+'nt'+'ended'='INTENDED'
'as' is the link.
(Other definitions for intended that I've seen before include "Fiance (e) - on purpose" , "Person engaged" , "Fianc(e) - proposed" , "Fiancé (e) - on purpose" , "Had in mind to" .)