Servant worried about this compiler's declarations (9)

'declarations' is the definition.
(averment is a kind of declaration)

'servant worried about this compiler's' is the wordplay.
'worried' indicates an anagram (worry can mean to interfere with or disturb).
'about' means one lot of letters goes inside another.
'this compiler' becomes 'me' (the person who is writing these clues).
'servant' with letters rearranged gives 'avernts'.
'avernts' going around 'me' is 'AVERMENTS'.