Glue parts damaged by idiot's spill (7)
I believe the answer is:
divulge
'spill' is the definition.
(thesaurus)
'glue parts damaged by idiot's' is the wordplay.
'parts damaged' indicates an anagram (parts of the word are damaged).
'by' says to put letters next to each other.
'idiot' becomes 'div' (div can mean a foolish person).
'glue' anagrammed gives 'ulge'.
'ulge' put after 'div' is 'DIVULGE'.
(Other definitions for divulge that I've seen before include "Make public" , "Reveal as with information" , "Make known (a secret)" , "Disclose, give away" , "Disclose (a secret)" .)