gave it a go (9)
'gave it a go' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tried that I've seen before include "heard in court" , "Attempted" , "Had a crack" , "Made an effort" , "Endeavoured" .)
(Other definitions for undertook that I've seen before include "Tackled" , "Engaged in" , "Formally promised (to do something)" .)