King confronted king in charge of squares, circles, etc. (9)
I believe the answer is:
geometric
'squares circles etc' is the definition.
I can't tell whether this defines the answer.
'king confronted king in charge of' is the wordplay.
I cannot quite understand how this works, but
'king' could be 'r' (abbreviation for rex, king in Latin) and 'r' is present in the answer.
'confronted' could be 'met' (I've seen this in another clue) and 'met' is found in the answer.
'of' could be 'o' and 'o' is found in the answer.
'in charge' could be 'ic' (abbreviation for 'in charge') and 'ic' is present in the answer.
The remaining letters 'ge' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for geometric that I've seen before include "Relating to the branch of mathematics concerned with lines" , "Of a branch of maths" , "Studying figures" , "Characterised by lines, points and surfaces" , "with great regularity" .)