Slender craft is a visual creation (4,3)
I believe the answer is:
fine art
'visual creation' is the definition.
'fine art' can be an answer for 'creation' (fine art is a kind of creation). I am not certain of the 'visual' bit.
'slender craft' is the wordplay.
'slender' becomes 'fine' (synonyms).
'craft' becomes 'art' (both can mean cunning or trickery).
'fine'+'art'='FINE ART'
'is a' is the link.
Can you help me to learn more?
(Other definitions for fine art that I've seen before include "In after (anag) - painting, sculpture etc" , "Such as painting, sculpture or architecture" , "Canvas perhaps" , "aesthetic production" , "Thing of beauty" .)