Condescends, capturing son in sketches (7)
I believe the answer is:
designs
'sketches' is the definition.
(design is a kind of sketch)
'condescends capturing son' is the wordplay.
'condescends' becomes 'deigns' ('deign' can be a synonym of 'condescend').
'capturing' means one lot of letters goes inside another.
'son' becomes 's'.
'deigns' enclosing 's' is 'DESIGNS'.
'in' acts as a link.
(Other definitions for designs that I've seen before include "'Blueprints, patterns (7)'" , "Intentions" , "Plans" , "Plots" , "intended purposes" .)