Issue more than the others - the maximum (9)
I believe the answer is:
uttermost
'maximum' is the definition.
(I know that maximum can be written as uttermost)
'issue more than the others' is the wordplay.
'issue' becomes 'utter' (I've seen this before).
'more than the others' becomes 'most' (I've seen this in another clue).
'utter'+'most'='UTTERMOST'
'the' is the link.
(Other definitions for uttermost that I've seen before include "best" , "Greatest possible extent" , "Extreme" , "The furthest point or degree" , "Maximum - extremity" .)