For example, a claret I spilt (7)
I believe the answer is:
article
'for example a' is the definition.
(A is an article in grammar)
'claret i spilt' is the wordplay.
'spilt' indicates an anagram.
'claret'+'i'='clareti'
'clareti' with letters rearranged gives 'ARTICLE'.
(Other definitions for article that I've seen before include "You might say one" , "Particular object and newspaper report" , "Thing - composition - item" , "leader" , "Perhaps an" .)