Changes man set about to conceal repair (10)
I believe the answer is:
amendments
'changes' is the definition.
(amendment is a kind of change)
'man set about to conceal repair' is the wordplay.
'about' indicates an anagram.
'to conceal' is an insertion indicator.
'repair' becomes 'mend' ('mend' can be a synonym of 'repair'**).
'man'+'set'='manset'
'manset' with letters rearranged gives 'aments'.
'aments' going around 'mend' is 'AMENDMENTS'.
(Other definitions for amendments that I've seen before include "Changes to parliamentary bill" , "adjustments required" .)