Picture king amongst group of pieces leading to check (6)
I believe the answer is:
sketch
'picture' is the definition.
(I've seen this before)
'king amongst group of pieces leading to check' is the wordplay.
I cannot quite understand how this works, but
'king' could be 'k' (chess abbreviation) and 'k' is found within the answer.
'group' could be 'set' (both can mean a collection) and 'set' is present in the leftover letters.
'check' could be 'ch' (abbreviation) and 'ch' is found within the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for sketch that I've seen before include "Short dramatic scene" , "Brief outline or drawing" , "bit of a performance" , "Unfinished drawing" , "Outline - preliminary drawing" .)