Origin of outcry supported by Times over a former acid compound (7)
I believe the answer is:
oxalate
'acid compound' is the definition.
(type of acid)
'origin of outcry supported by times over a former' is the wordplay.
'origin of' suggests taking the first letters.
'supported by' means one lot of letters go next to another (letters go below - in down clue).
'times' becomes 'x' (multiplication sign).
'over' means one lot of letters go next to another.
'former' becomes 'late' ().
The initial letter of 'outcry' is 'o'.
'o'+'x'+'a'+'late'='OXALATE'
(Other definitions for oxalate that I've seen before include "that's salty!" , "Acid salt; a lax toe (anag.)" .)