Like that far-fetched story about the giant? (4)
I believe the answer is:
tall
'the giant?' is the definition.
(thesaurus)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for tall that I've seen before include "Above average height" , "Vertically large" , "that's hard to swallow" , "Of great height" , "Like giants" .)