I'm taking long time to produce picture (5)
I believe the answer is:
image
'picture' is the definition.
(I know that picture can be written as image)
'i'm taking long time' is the wordplay.
'taking' says to put letters next to each other.
'long time' becomes 'age' (an age is a period of time).
'im'+'age'='IMAGE'
'to produce' acts as a link.
(Other definitions for image that I've seen before include "Likeness or mental picture" , "Photo or likeness" , "Idol; simile" , "Simulacrum" , "Metaphor; figure" .)