I am taking a long time getting the picture (5)
I believe the answer is:
image
'the picture' is the definition.
('image' can be a synonym of 'picture')
'i am taking a long time getting' is the wordplay.
'taking' is a deletion indicator (take can mean remove or delete).
'long time' becomes 'age' (an age is a period of time).
'getting' is a charade indicator (letters next to each other).
'am' with 'a' taken out is 'm'.
'i'+'m'+'age'='IMAGE'
(Other definitions for image that I've seen before include "Epitome" , "Picture (involving one letter change from 10)" , "Likeness or mental picture" , "Likeness; metaphor" , "Metaphor; figure" .)