However, vendor considered all possibilities (7,3)
 
                        
                    I believe the answer is:
thought out
'considered all possibilities' is the definition.
'thought-out' can be an answer for 'considered' (thesaurus). I'm unsure of the 'all possibilities' bit.
'however vendor' is the wordplay.
'however' becomes 'though' (synonyms).
'vendor' becomes 'tout' (tout is a kind of vendor).
'though'+'tout'='THOUGHT-OUT'
Can you help me to learn more?
(Another definition for thought out that I've seen is " Planned".)
                                I've seen this clue in The Daily Express.
                            
                        
                    
                
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