Call-up date wrongly issued (8)
I believe the answer is:
emanated
'issued' is the definition.
(to emanate is to issue or emit)
'call-up date wrongly' is the wordplay.
'call' becomes 'name' (as in calling or naming someone something).
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'wrongly' is an anagram indicator.
'name' back-to-front is 'eman'.
'date' anagrammed gives 'ated'.
'eman'+'ated'='EMANATED'
(Other definitions for emanated that I've seen before include "Issued or originated from a source" , "Emerged or originated" , "came forth" , "Issued forth, as from a source" , "Flowed" .)