Nothing penned by playwright makes suggestion (7)
I believe the answer is:
pointer
'suggestion' is the definition.
(thesaurus)
'nothing penned by playwright' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'penned by' means one lot of letters goes inside another.
'playwright' becomes 'pinter' (Harold Pinter).
'o' put into 'pinter' is 'POINTER'.
'makes' is the link.
(Other definitions for pointer that I've seen before include "Guide" , "Hint (for a dog?)" , "Sign" , "helpful tip!" , "Tip; dog" .)