Ark got into difficulty; alternative transport required (2-4)
I believe the answer is:
go-kart
'difficulty alternative transport required' is the definition.
I can't tell whether this definition defines the answer.
'ark got' is the wordplay.
'ark got' anagrams to 'GO-KART'.
Though, I am not clear how this is indicated.
'into' is the link.
Can you help me to learn more?
(Other definitions for go-kart that I've seen before include "Small racing vehicle (K, not C)" , "Small, low racer" , "Lightweight racer" , "Small racing car" , "Small motor-racing vehicle" .)