Friend totally childless (4)
I believe the answer is:
ally
'friend' is the definition.
(an ally is a friend or supporter)
'totally childless' is the wordplay.
'ALLY' is hidden in amongst the letters.
However, I'm unsure how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for ally that I've seen before include "Associate that provides assistance" , "Co-operative friend" , "Comrade in arms" , "Cooperating country" , "One co-operating with another" .)