Look at cross horrible meanie carries (7)
I believe the answer is:
examine
'look at' is the definition.
(synonyms)
'cross horrible meanie carries' is the wordplay.
'cross' becomes 'x' (X is cross-shaped).
'horrible' indicates anagramming the letters.
'carries' indicates putting letters inside.
'meanie' is an anagram of 'eamine'.
'x' inserted inside 'eamine' is 'EXAMINE'.
(Other definitions for examine that I've seen before include "Inspect , test" , "vet" , "Question, test" , "Look closely at < test" , "Appraise" .)