Call our former demand (7)
I believe the answer is:
exclaim
'call' is the definition.
(I've seen this before)
'former demand' is the wordplay.
'former' becomes 'ex' (prefix meaning former or onetime).
'demand' becomes 'claim' (claim is a kind of demand).
'ex'+'claim'='EXCLAIM'
'our' is the link.
This may not be right. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for exclaim that I've seen before include "Cry out (in shock, etc)" , "Declare" , "Shout out" , "Speak suddenly" , "Call" .)