Phoney compiler withheld one answer (4)
I believe the answer is:
liar
'phoney' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for liar that I've seen before include "Perjuror" , "one telling a story" , "27 [DECEIVER]" , "Untruthful person (Billy in Schlesinger film)" , "Teller of untruths" .)