Called for or lacked (6)
I believe the answer is:
needed
I believe this clue is a double definition.
'called for' is the first definition.
('need' can be a synonym of 'call for')
'lacked' is the second definition.
(I've seen this in another clue)
(Other definitions for needed that I've seen before include "Obligatory" , "Missing" , "'Lacked, required (6)'" , "Required; sounds like worked (dough)" , "Lacked something essential" .)