Agreed to put the lot in a bound cover (7)
I believe the answer is:
tallied
'agreed' is the definition.
('tally' can be a synonym of 'agree')
'the lot in a bound cover' is the wordplay.
'the lot' becomes 'all' (I've seen this in another clue).
'in' is an insertion indicator.
'a bound cover' becomes 'tied' (I am not sure about this - if you are sure you should believe this answer much more).
'all' put inside 'tied' is 'TALLIED'.
'to put' acts as a link.
Can you help me to learn more?
(Other definitions for tallied that I've seen before include "Agreed, corresponded" , "Matched" , "Corresponded - kept score" , "Agreed; calculated" , "Reckoned debt or score" .)