Methodical setter in Cologne provided with one cruciverbalist's tip (10)
I believe the answer is:
scientific
'methodical' is the definition.
(I've seen this before)
'setter in cologne provided with one cruciverbalist's tip' is the wordplay.
'setter' becomes 'I' (the person who set this crossword).
'in' indicates putting letters inside.
'cologne' becomes 'scent' (cologne is a type of scent).
'provided with' is a charade indicator (letters next to each other).
'one cruciverbalist's tip' becomes 'ific' (I am not sure about this - if you are sure you should believe this answer much more).
'i' going into 'scent' is 'scient'.
'scient'+'ific'='SCIENTIFIC'
Can you help me to learn more?
(Other definitions for scientific that I've seen before include "Based on observation" , "Systematic; methodical" , "using what's proven" , "Trained in biology, perhaps" , "As experiment" .)