Writer pens outline of script in café (6)
I believe the answer is:
bistro
'cafe' is the definition.
(I've seen this before)
'writer pens outline of script' is the wordplay.
'writer' becomes 'biro' (type of pen, something which writes).
'pens' indicates putting letters inside (inserted letters are held or penned in).
'outline of' means to remove the middle letters (outline refers to the letters on the edges).
'script' with its middle removed is 'st'.
'biro' placed around 'st' is 'BISTRO'.
'in' acts as a link.
(Other definitions for bistro that I've seen before include "Small informal French restaurant" , "Small restaurant - robs it (anag)" , "Small inexpensive eatery" , "Small bar-cum-restaurant" , "Cafe/restaurant" .)