Allow to go for nothing (4)
I believe the answer is:
free
'for nothing' 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 free that I've seen before include "Reef (anag.)" , "Under no obligation" , "unlike battery hens" , "Available - for love" , "Untie" .)