Meant somehow to conceal the repair and the alteration (9)
I believe the answer is:
amendment
'the alteration' is the definition.
(I've seen this before)
'meant somehow to conceal the repair' is the wordplay.
'somehow' indicates an anagram.
'to conceal' is an insertion indicator.
'the repair' becomes 'mend' (I've seen this before).
'meant' with letters rearranged gives 'ament'.
'ament' placed around 'mend' is 'AMENDMENT'.
'and' is the link.
(Other definitions for amendment that I've seen before include "Change designed to improve a text" , "Addition or alteration, to a motion or official document, say" , "Statement added to or revising a document" , "Correction" , "Corrective treatment" .)