Crooked rooster had a look! (8)
I believe the answer is:
cockeyed
'crooked' is the definition.
(similar in meaning)
'rooster had a look' is the wordplay.
'rooster' becomes 'cock' (synonyms).
'had a look' becomes 'eyed' (I've seen this in another clue).
'cock'+'eyed'='COCKEYED'
(Other definitions for cockeyed that I've seen before include "Crazy" , "at an angle" , "Crooked; absurd" , "Not level; absurd" , "Skew-whiff" .)