Official to an extent securing home cover again (8)
I believe the answer is:
refinish
'cover again' is the definition.
(cover with a finish again)
'official to an extent securing home' is the wordplay.
'official' becomes 'ref' (match official in football, say).
'to an extent' becomes 'ish' (eg yellowish means somewhat yellow).
'securing' indicates putting letters inside.
'home' becomes 'in' ('he's home' can mean 'he's in').
'ref'+'ish'='refish'
'refish' placed around 'in' is 'REFINISH'.
(Other definitions for refinish that I've seen before include "Give a new coat" , "Give a new surface to" .)