Author Ambler (4)
I believe the answer is:
eric
'author ambler' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eric that I've seen before include "Fine" , "Mr Clapton" , "---- Cantona, Manchester Utd favourite of the 1990s" , ".... the Red, Norwegian explorer who discovered Greenland in 10th century" , "-- Clapton, guitarist" .)