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' is an anagram indicator.
'to conceal' indicates putting letters inside.
'the repair' becomes 'mend' (I've seen this in another clue).
'meant' with letters rearranged gives 'ament'.
'ament' enclosing 'mend' is 'AMENDMENT'.
'and' acts as a 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" .)