A wide track is crooked (4)
I believe the answer is:
awry
'crooked' is the definition.
(similar in meaning)
'a wide track' is the wordplay.
'wide' becomes 'w' (abbreviation e.g. in cricket).
'track' becomes 'RY' (abbreviation for railway).
'a'+'w'+'ry'='AWRY'
'is' acts as a link.
(Other definitions for awry that I've seen before include "Wary but distorted." , "Wrong -- twisted to one side" , "turning to one side" , "Off-centre" , "Haywire" .)